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Which of the following values of a and b...

Which of the following values of a and b will make `a(sin^(6)theta+cos^(6)theta)-b(sin^(4)theta+cos^(4)theta)` independent of `theta` ?

A

`(-infty,-1]cup[3,infty)`

B

`(-infty,-1)cup(3,infty)`

C

`[-1,3]`

D

`(-infty.infty)`

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The correct Answer is:
A
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