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If f(x) = 3(sin x - cos x)^(4) + 6(sin x...

If `f(x) = 3(sin x - cos x)^(4) + 6(sin x + cos x)^(2) +4(sin^(6)x + cos^(6)x)` and `f(pi/7) = 13` then find `f (2pi/7)`.

A

14

B

11

C

12

D

13

Text Solution

Verified by Experts

The correct Answer is:
C
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KIRAN PUBLICATION-TRIGONOMETRY -TYPE - II
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