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The value of cos^2 17° - sin^2 73° is A. 1 B. 1/3 C. 0 D. -1

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The value of cos2 17° - sin2 73° is 

A. 1 

B. \(\frac{1}{3}\) 

C. 0 

D. -1

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1 Answer

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Best answer

cos2 17° - sin2 73° = cos2 17° - sin2(90° -17°) 

= cos217° - cos2 17° = 0

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