The Support area hosts a number of **use cases** and **frequently asked questions**. The general sections focus on the iOS version, the bottom section outlines the differences and keyboard shortcuts in the Mac version.

Adding Sales Tax or VAT is easier with Inseries than with most other calculators. Simply type in the price and then add the tax by adding the actual percentage (e.g. 20% for Austria's VAT). Inseries will intuitively guess that you really want to add the percentage rather than the number 0.2 ;-). A tip: you probably also want to switch to two fraction digits mode by double tapping on the result field.

Also subtracting discounts is very easy with Inseries. Like for adding taxes, you can also deduct discounts simply by subtracting the actual percent discount (e.g., "-30%"). Inseries will then assume that you want to subtract 30% of the left operand value. Again you may want to switch two fraction digits mode by double tapping on the result field.

Sometimes you need to sum up many numbers and you want to keep track on what you already entered. The best way to do this with Inseries is by entering each number followed by the quick-sum key on the calculator keypad. The `quick-sum` key always adds the entered number to the current result, so you save a key press and you see all summed up numbers nicely on top of each other. A tip: clear the result before starting such a calculation, this will add a stronger separator line below the previous result.

All trigonometric functions such as `sin`, `cos`, and `tan` are located in the functions chooser that you access via the `f` function key on the left bottom of the calculator keypad. You simply choose the function and then enter the function's argument (within the brackets). If you want to use degrees rather than radians you can enter them as "180°" using the degrees `°` key.

Humans are inherently bad at coming up with random numbers, therefore a random number generator can sometimes come in handy. The `rand` function does not take any arguments and returns a random decimal number between 0 and 1. The `dice6` function simulates a standard 6-sided dice, the more generic `dice` function takes the number of sides as its only argument, e.g., dice(10) for a 10-sided dice.

Inseries provides a built-in `%` modulo operator to calculate the remainder of a division (e.g., 5 % 2).

If you start a new calculation with an operator you are implicitly using the current result as the left operand. In order to use the result in the middle of a calculation, or as an operand for a function you can use the `R` button on the calculator keypad.

Yes, long-tapping the `backspace key` (located in the top-left corner of the calculator keypad) will clear the calculation field.

Long-tap on the result field to bring up the result field menu. Select the `Copy` action to copy the result into the clipboard.

You can delete any row that is not referenced by another calculation via swipe-to-delete (swiping left on the given row); as the last calulation cannot be referenced by any other calculation, you can always delete the last calculation.

The easiest way to clear the result field is to use a swipe-right gesture on the right-hand side of the result field. Alternatively, you can long-tap on the result field to bring up the result field menu and use the `Clear Result` action.

Yes, long-press the clear (`C`) button in the upper left corner of the key pad in order to clear all previous calculations and results.

You can enter dates using one of two formats: DD.MM.YYYY, or MM.DD.YYYY (or DD,MM,YYYY if the ',' is your decimal separator). You can switch between both formats using the result field context menu. You can also enter two-digit years (YY) where years 70 or higher are interpreted as 1970, 1971, etc. and lower years as 2001, 2002, 2003,...

You can subtract the two dates from each other (e.g., 2.11.2014 - 2.6.2014). You can also use the `dweek` and `dmon` functions to calculate the number of weeks or months by passing the start and end date as its arguments, e.g., dweek(2.6.2014, 2.11.2014).

Yes, simply use the standard `+` operator to add days to a date (e.g., 2.6.2014 + 5).

Yes, simply use the `today` function.

Yes, you can use the `week` function in combination with the `today` function to calculate the current calendar week, e.g., week(today()).

Use a swipe-left gesture to "slide" the result into the memory on the left side of the result field. The memory icon will become darker when a value has been stored in memory. Alternatively, use the 2nd function of the `M` button.

Use a swipe-right gesture on the *left* side of the result field to "push" the memory variable into the calculation field ("M"). Alternatively, you can use the `M` button on the calculator keypad.

Use a swipe-up gesture on the left side of the result field to clear the memory. The memory icon will get lighter again when the memory has been cleared.

Inseries provides three different fraction digit modes: All fraction digits (default), 2 fraction digits, and 4 fraction digits. You toggle between fraction digit modes via double-tapping onto the result field. You know that you are in 2 fraction digit mode if a small `2` is shown to the right of the result field; the 4 fraction digit mode shows a small `4`. The fraction digit mode is an implicit app setting and, thus, persists between app restarts.

You can access all functions via the "f" function key on the left bottom of the calculator keypad. Most functions take a single argument right after the opening bracket (e.g. `sin`, `cos`, `tan`, `round`). The modulo function `mod` takes two arguments that need to be separated by the argument separator key (comma ',' or semicolon ';' depending on your locale settings). The random value function `rand` takes no arguments.

You can access all built-in constants via the 2nd function (`c`) of the `f` function key in the lower left area of the calculator keypad. The most often used constants `pi` and `e` are accessible directly via the key right above the function key. All other mathematical constants are accessible via the function chooser only. If you want to "see" the decimal number behind a constant simply add it to an empty calculation and press the enter key on the calculator keypad.

The default global hotkey for activating Inseries is `CTRL+CMD+0`; you can configure the global hotkey using the preferences window accessible via the gear drop-down menu. In order to close Inseries without quitting it simply press the `ESC` key.

Yes, you can switch on auto-startup in the preferences window that is accessible through the gear drop-down menu.

Of course, simply use the gear drop-down menu to open the preferences window and switch to the black-and-white menu bar icon.

Use `CMD+S` to store the current result in memory. Either use `CMD+R` to access the memory, or simply use the `M` or `m` variable.

Use `CMD+DELETE` to delete the current result. Press `CMD+B` to go back to the previous result. You can also delete all results by using the `SHIFT+CMD+DELETE` shortcut (this functionality is also accessible via the gear drop-down menu).

If you know the name of the constant or function simply type it in (the names are case insensitive for easier usage), e.g., simply type `pi` or `PI`. Alternatively you can press `SHIFT+CMD+F` to access the function chooser context menu, or `SHIFT+CMD+C` to access the constant chooser menu.

Sure, simply use `CMD+2`, `CMD+4`, `CMD+9`, or `CMD+0` for 2, 4, all, or no fraction digits respectively.