sin (50+A)-cos (40-A)
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=sin(50+A) -cos(40-A)
=sin(50+A)-cos(90-40+A)
=sin(50+A)-sin(50+A)
=0
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Answered by
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Answer:
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Step-by-step explanation:
= sin(50+A)-cos(90-40+A)
= sin(50+A)-sin(50+A)
=0
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