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Question
Evaluate: sin (90° - A) sin A - cos (90° - A) cos A
Sum
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Solution
sin (90° - A) sin A - cos (90° - A) cos A
= cos A sin A - sin A cos A
= 0
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Chapter 21: Trigonometrical Ratios [Sine, Consine, Tangent of an Angle and their Reciprocals] - EXERCISE 21 (F) [Page 334]
