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The value of cos^273º + cos^2 47º - sin^2 43º + sin^2107º is equal to :

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The value of cos273º + cos2 47º - sin2 43º + sin2107º is equal to :

(A) 1 

(B) 1/2 

(C) √3/2 

(D) sin273° + cos273°

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1 Answer

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Correct option (A) (D)

Explanation:

cos2 73º + cos2 47º - sin2 43º + sin2 107º

= cos2 (90 – 17) + cos2 (90 – 43) – sin2 43) + sin2 (90 + 17) = sin217 + sin243 – sin243 + cos217 = 1

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