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Evaluate \(\cos \left(180^{\circ}+x\right)\)
in Mathematics by Platinum (108k points) | 190 views

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\(\cos \left(180^{\circ}+x\right)=\cos \left(180^{\circ}\right) \cdot \cos (x)-\sin \left(180^{\circ}\right) \cdot \sin (x)\)

\(=-1 \cdot \cos (x)-0 \cdot \sin (x)\)
\(=-\cos (x)\)
by Platinum (108k points)

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