Sine and Cosine in one problem?

Question

Is it possible to use sine and cosine in one word problem? If so, please give an example.

Answer 1

You can use sin and cos in trigonometric identities like: (Sinx)^2 + (Cosx)^2=1

Answer 2

Yes it is.  Here is an example:

 

A right triangle has a base of length 3 and a height of 4.  Find the sine of each acute angle, and show it is the same as the cosine of the other acute angle.