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Find the exact value of:

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

1 answer

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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