-) cos A cos(90° - A) -sin A sin (90°- A) = 0 coc A
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1 is the answer
Step-by-step explanation:
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Answer:
Step-by-step explanation:
cos A cos ( 90° - A) - sin A sin ( 90° - A )
= cos A sin A - sin A cos A
= sin ( 90° - A )
= cos A
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