Mathematics
Evaluate :
sin (90° - A) sin A - cos (90° - A) cos A
Trigonometric Identities
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Answer
sin (90° - A) sin A - cos (90° - A) cos A
= cos A sin A - sin A cos A
= 0
Hence, sin (90° - A) sin A - cos (90° - A) cos A = 0.
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