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प्रश्न
Evaluate: sin 15° cos 15° - cos 75° sin 75°
बेरीज
उत्तर
sin 15° cos 15° - cos 75° sin 75°
= sin(90° - 75°) cos15° - cos 75° sin (90° -15°)
= cos 75° cos 15° - cos 75° cos 15°
= 0.
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Complementary Angles for Sine ( Sin ) and Cosine ( Cos )
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