If sin of angle A is 15/17 what is the cosine of angle A
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Answer:
CosA = √(1 - sin²A)
cosA = √(1 - 225/289) = √(64/289) = 8/17
Another method is to draw a right triangle with side opp. to angle a = 15 and hypotenuse = 17
This is because sin = opp. side/hyp
You can find adj. side by pythagoras theorem, and then find cosA
cis = adj. side/hypotenuse
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