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प्रश्न
Evaluate: sin2 35° - cos2 55°
योग
उत्तर
sin2 35° - cos2 55°
= sin2 35° - [cos(90° - 35°)]2
= sin2 35° - sin2 35°
= 0
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Complementary Angles for Sine ( Sin ) and Cosine ( Cos )
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