What about sines and cosines?

Question

Startups

At the moment I am finishing work on a startup, the purpose of which is to explain mathematics/geometry as simply as possible, but unfortunately I stuck a question with geometry, for example, C=90 degrees SIN A = 7/25, the question is, find cos A, I know very well that here you just need to find cos using the 1-sin squared formula and that’s it, but on the forum I am constantly asked the question: how easy is it to remember them? How easy is it for them to explain everything?

Answer 1

The best way to remember a formula is to understand it. Now, if you explain in an accessible way why the sum of the squares of sine and cosine is always equal to 1, then it will be easier to remember the formula.
I didn’t understand what the triangle has to do with it, if you just need to express the cosine through the sine and vice versa ....

Answer 2

How easy is it for them to explain everything?

Hire a normal teacher for the project.

Answer 3

How easy are they to remember?

Write it out on a piece of cardboard and admire it at any opportunity.