If cos x = 0.42, which of the following is cos(x +12π)?
A. 0.042
B. 0.04
C. 0.54
D. 0.42
1
Expert's answer
2013-06-06T10:24:56-0400
Cosine function is periodic with period 2pi. Due to it, cos(x+2pi*k)=cos x for any integer k. In our case k=6: cos(x+12pi)=cos(x+6*2pi)=cos x Thus, correct answer is D.
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