Question

If sin A 3/4 calculate cos A.
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Answer 1

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