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|. है () sin 25° cos 65° + cos 257 sin 65 |
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Answer» sin 25 cos 65 + cos 25 sin 65[using sin (90 - x) = cos x and cos(90 - x) = sin x] = sin 25 sin(90 - 65) + cos 25 cos (90 - 65) = sin 25 sin 25 + cos 25 cos 25 = sin^2 25 + cos^2 25[using sin^2 x + cos^2 x = 1] = 1 |
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