CPM Homework Help : PC3 Problem 8-47

Given the equation $s^{2} + c^{2} = 1$ , simplify each of the following expressions.

Hint:

Rewrite the given equation in its various forms.
Substitute the appropriate expressions in each of the parts below.

Forms:

$s^{2} = 1 − c^{2}$
$c^{2} = 1 − s^{2}$

$4 – 4s^{2}$
Hint (f):
Factor out a $4$ first. Then substitute an expression for $s^{2}$ .