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12-11-2019
Mathematics

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[tex] \cos( \alpha + \frac{\pi}{2} ) = - \sin( \alpha ) [/tex]
why is it equal

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12-11-2019

[tex]

\cos (\alpha +\frac{\pi}{2})= \cos(\frac{\pi}{2})\cos (\alpha)- \sin(\frac{\pi}{2})\sin(\alpha)\\

=0-\sin(\alpha)\\

=-\sin (\alpha)[/tex]

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