Question

How do you remember soh cah toa?

Answer 1

soh cah toa
seems like quite a good mnemonic to me.

If you need an image to help you, imagine a soccer player having hurt their big toe, which is now somewhat red and painful, causing them to cry out.

Soccer toe ahh

Personally I just picture a right angle triangle with one side sitting on the x axis, with something like a `30^o` angle at the origin. As the angle is increased so does the opposite side. If the hypotenuse is of length 1 so that the vertex above the y axis lies on the unit circle then the y coordinate is `sin theta` and the x coordinate is `cos theta`. I think of `tan theta` as `sin theta / cos theta`.