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Let f(x)=cos10x+cos8x+3cos4x+3cos2x and ...

Let `f(x)=cos10x+cos8x+3cos4x+3cos2x` and `g(x)=8cosxcos^3(3x)` then for all `x ` we have

A

`f(x) = g(x)`

B

`2f(x) = 3g(x)`

C

`f(x) = 2g(x)`

D

`2f(x) = g(x)`

Text Solution

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A
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