Express the given quantity in terms of sin x or cos x.
-$$\cos ( 4 \pi + x )$$
A) $\cos x$
B) $- \cos x$
C) $- \sin x$
D) $\cos x - \sin x$

Name: Express the given quantity in terms of sin x or cos x. -\[\cos ( 4 \pi + x )\] A) $\cos x$ B) $- \cos x$ C) $- \sin x$ D) $\cos x - \sin x$
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Question

Quizplus · Accepted Answer

The cosine function is periodic with a period of $2\pi$, meaning $\cos(\theta + 2\pi k) = \cos \theta$ for any integer $k$. Therefore, $\cos(4\pi + x) = \cos x$.

Express the Given Quantity in Terms of Sin X or Cos