They want you to use a right triangle to express the inverse tangent functions in terms of x.
It can also be done algebraically.
Find an algebraic expression equivalent to the given expression. (hint : use right triangles)
a. sin(tan inverse(^-1 it says in paper) x)
b. cos(tan inverse(^-1 it says in paper) x)
what does it want me to do? How can i approach this problem?