We don’t really know how to find the sine of an angle in a right triangle, but we can tell you where to go on your iPhone to do it.

If you open Apple’s built-in calculator app, you’ll find basic functions for adding and multiplying and such. But tilting your iPhone into landscape mode will expand the app to show scientific calculator functions. Sine, cosine, log, exponents — they’ve all been there right under your nose this whole time!