trig

Angle θ lies in the second quadrant, and sin θ = 3/5.
Find cos θ and tan θ.

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  1. Draw the triangle.

    sinθ = y/r
    cosθ = x/r
    tanθ = y/x

    In QII,
    y = 3
    x = -4
    r = 5

    so,

    cosθ = -4/5
    tanθ = -3/4

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