# pre-calculus

posted by
**lina**
.

Rewrite the expression so that it involves the sum or difference of only constants and sines and cosine to the 1st power

(cos 5x)^2

posted by
**lina**
.

Rewrite the expression so that it involves the sum or difference of only constants and sines and cosine to the 1st power

(cos 5x)^2