Use the Power-Reducing Formulas
-$8 \cos ^ { 2 } x$
A) $4 + 4 \cos 2 x$
B) $4 - 4 \cos 2 x$
C) $1 + \cos 2 x$
D) $16 \cos x$

Name: Use the Power-Reducing Formulas -$8 \cos ^ { 2 } x$ A) $4 + 4 \cos 2 x$ B) $4 - 4 \cos 2 x$ C) $1 + \cos 2 x$ D) $16 \cos x$
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Question

Quizplus · Accepted Answer

The power-reducing formula for cosine is $\cos^2 x = \frac{1 + \cos 2x}{2}$. Multiplying both sides by 8 gives $8 \cos^2 x = 4 + 4 \cos 2x$.

Use the Power-Reducing Formulas - 8cos⁡2x8 \cos ^ { 2 } x8cos2x

Use the Power-Reducing Formulas
- $8 \cos ^ { 2 } x$