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sin^2 25° + sin^2 65° is equal to

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sin2 25° + sin2 65° is equal to 

(a) 0 

(b) 2 sin2 25° 

(c) 2 cos2 65° 

(d) 1

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Best answer

(d) 1

sin2 25° + sin2 65° = sin2 (90° – 65°) + sin2 65° 

= cos2 65° + sin2 65° = 1.

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