5cos(×-20°)=-1,865

I need to solve for theta
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cos(x-20)=-1.865/5=-0.373. So x-20=111.90 approx, x=131.90°. There are other solutions because of the cyclic nature of cosine. Another solution is x-20=360-111.90=248.10°, so x=268.10º.

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