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Eamcet Mathematics
Trigonometry : Multiple And Submultiple Angles

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If α is a root of 25cos2θ+5cosθ-12=0,π/2<α<π ,then sin2α is equal to

A. 24/25

B. -24/25

C. 13/18

D. -13/18

E. None of the above

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Correct choice: A

Explanation:

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Eamcet Mathematics Trigonometry : Multiple And Submultiple Angles

Eamcet Mathematics
Trigonometry : Multiple And Submultiple Angles