If sin A 3/4 calculate cos A.
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Answer:
sin A=3/4
we know
sin^2A+cos^2A=1
=> (3/4)^2+cos^2A=1
=> cos^2A=1-9/16
=> cos^2A=(16-9)/16
=> cos^2A=7/16
=> cosA=√7/4
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