Given that $0{}^\circ

Question

Given that $0{}^\circ <x<180{}^\circ $, find the possible values of $x$ for each of the following, correcting your answer to $1$ decimal place. $\cos x=-0.811$, $\sin x=0.215$.

Accepted Answer

(i) $x=144.2^\circ$ (ii) $x=12.4^\circ$ or $x=167.6^\circ$

Trigonometric Equations: Finding Angle Values in the \(0^\circ\) to \(180^\circ\) Range

Trigonometric Equations: Finding Angle Values in the \(0^\circ\) to \(180^\circ\) Range

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