### Home > PC3 > Chapter 8 > Lesson 8.2.2 > Problem 8-74

8-74.

Given

*s*^{2}+*c*^{2}= 1, rewrite the following expressions using only*c*. Homework Help ✎*c*^{2}–*s*^{2}

Rewrite the given equation for *s*^{2}.

Then substitute in that expression.

8-74.

Given

*s*^{2}+*c*^{2}= 1, rewrite the following expressions using only*c*. Homework Help ✎*c*^{2}–*s*^{2}

Rewrite the given equation for *s*^{2}.

Then substitute in that expression.