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2 [ sin x - cos x ]^(4) + 6 [ sin x + co...

`2 [ sin x - cos x ]^(4) + 6 [ sin x + cos x ]^(2) + 5 [ sin^(6)x + cos^(6) x ] = ?`
(a)6
(b)4
(c)3
(d)13

A

6

B

4

C

3

D

13

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