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प्रश्न
Evaluate: sin2 40° - cos2 50°
बेरीज
उत्तर
sin2 40° - cos2 50°
= sin2 (90° - 50°) - cos2 50°
= cos2 50° - cos2 50°
= 0
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Complementary Angles for Sine ( Sin ) and Cosine ( Cos )
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