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If tan theta=3/4 then find the value ofcos^2 theta - sin ^2 theta

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  1. tanØ = 3/4 = y/x
    so x=4 and y=3 OR x = -4, y = -3
    r^2 = x^2 + y^2
    = 25
    r = 5

    cos^2 Ø - sin^2 Ø
    = (4/5)^2 - (3/5)^2
    = 16/25 - 9/25
    = 7/25

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