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प्रश्न
Evaluate: sin 42° sin 48° - cos 42° cos 48°
योग
उत्तर
sin 42° sin 48° - cos 42° cos 48°
= sin(90° - 48°)sin 48° - cos(90° - 48°)cos 48°
= cos 48° sin 48° - sin 48°cos 48°
= cos 48° sin 48° - cos 48° sin 48°
= 0
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Complementary Angles for Sine ( Sin ) and Cosine ( Cos )
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