The real roots of the equation cos^(7...

The real roots of the equation `cos^(7)x+sin^(4)x=1 ` in the
interval `(-pi,pi)` are

A

`-pi//2,0`

B

`-pi//2,0,pi//2`

C

`pi//2,0`

D

`0,pi//4,pi//2`

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The correct Answer is:

B

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