# Trigonometry

For how many values of x such that 0<x<360 do we have cos(x) = 0.1? (x is in radians)

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1. You will have to use a calculator for this one.
if cosx = .1
then x = 84.26° correct to 2 decimals
but cosine is positive in I or IV
so x = 360-84.26 = 275.74°

x = appr 84.26 or 275.74

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posted by Reiny

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