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Find the value if the trigonometric ratio ?

Find the value if the trigonometric ratio ?-example-1

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Answer:

cos Z =
(5)/(13)

Explanation:

cos Z =
(adjacent)/(hypotenuse) =
(YZ)/(XZ) =
(15)/(39) ( divide numerator/denominator by 3 )

cos Z =
(5)/(13)

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