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The root of the equation `cos^7 theta  – sin^4 theta` = 1 that lie in the interval `[0, 2pi]` is :–

The root of the equation `cos^7 theta  – sin^4 theta` = 1 that lie in the interval `[0, 2pi]` is :–

A.

2
B.

3

C.

4

D.

8

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