trig exact vales

Find the exact values requested. No decimal approximations.
Given that cot θ = 4 for an acute angle θ,
A. Find sinθ.
B. Find cos(2θ).

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  1. draw the triangle!

    adjacent/opposite = 4/1, so the hypotenuse is √17

    now you can find sin, cos, and 2*sin*cos

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