Question

If sin a=4 by 5,determine cos a
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Answer 1

Sin = 4/5 = Perpendicular/hypotenuse

CosA = Base/hypotenuse

Base = √hyp. ^- prep.^

Base= 3/5

May it helps you

Answer 2

3/5

Explanation:

`Sin A = (4)/(5)=(oppsite side)/(hypotenuse)`

Adjacent side² = hypotenuse² - opposite side²

= 5² - 4²

= 25 - 16

= 9

Adjacent side = √9 = 3

Cos A =
`(Adjacent side)/(hypotenuse) = (3)/(5)`