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