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The number of roots of the equation cos^7 θ – sin^4 θ = 1 that lie in the interval [0, 2π] is-

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The number of roots of the equation cos7 θ – sin4 θ = 1 that lie in the interval [0, 2π] is- 

 (A) 2 

(B) 3 

(C) 4 

(D) 8 

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Correct Option :- (A) 2

Explanation :-

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