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Show that \(\cos \left(90^{\circ}+\theta\right)=-\sin \theta\) by using the appropriate compound angle formula.
in Mathematics by Diamond (75,025 points) | 22 views

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\(\begin{aligned} \cos \left(90^{\circ}+\theta\right) & =\cos 90^{\circ} \cdot \cos \theta-\sin 90^{\circ} \cdot \sin \theta \\ & =(0) \cdot \cos \theta-(1) \cdot \sin \theta \\ & =0-\sin \theta \\ & =-\sin \theta\end{aligned}\)
by Diamond (75,025 points)

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MathsGee Android Q&A

MathsGee Android Q&A