Precalculus

Find the exact value of:

Cos(inverse tan 4/3 + inverse cos 5/13)

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  1. If the two angles are x and y,

    cos(x+y) = cosx*cosy - sinx*siny

    if tanx = 4/3,
    cosx = 3/5
    sinx = 4/5

    if cosy = 5/13,
    siny = 12/13

    Now just plug and chug

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