Solving Sine and Cosine Equations within the \(0^\circ < x < 180^\circ\) Domain

Solving Sine and Cosine Equations within the \(0^\circ < x < 180^\circ\) Domain

Secondary 3

Find obtuse angles \(A\) and \(B\) such that

\(\cos A=-0.658\),
\(\sin B=0.486\).

Correct your answers to \(1\) decimal place.

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Answer:(i) \(A=131.1^\circ\) (ii) \(B=150.9^\circ\)

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