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The principal value of cos^-1{1/√2[cos(9π/10) - sin(9π/10)]} is (A) 3π/20

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The principal value of cos-1{1/√2[cos(9π/10) - sin(9π/10)]} is

(A) 3π/20

(B) 7π/20

(C) 7π/10

(D None of these

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Correct option (D None of these   

Explanation:

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