Question

1+cos(18x)=____.

a) 2cos^2 (18x)
b) 2sin^2 (18x)
c) 2cos^2 (9x)
d) 2sin^2 (9x)

Answer 1

@Agl202 @jim_thompson5910 @Luigi0210

Answer 2

@Luigi0210 plz help

Answer 3

Is it only \(1+\cos(18x) \)?

Answer 4

yes

Answer 5

thats the whole question

Answer 6

Isn't it C?

Answer 7

It would be, yes :)
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Answer 8

THANK YOU!!

Answer 9

\[1+\cos 2\theta=2\cos ^2\theta\]

Answer 10

No problem :)