$\displaystyle cos\frac {x}{4} = 0$ What do I do here? And how do I know when to use $\displaystyle 2n\pi$ or $\displaystyle n\pi$
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Originally Posted by >_<SHY_GUY>_< $\displaystyle cos\frac {x}{4} = 0$ What do I do here? And how do I know when to use $\displaystyle 2n\pi$ or $\displaystyle n\pi$ you should know where $\displaystyle \cos(u) = 0$ from your knowledge of the unit circle ... $\displaystyle \frac{x}{4} = \frac{\pi}{2} \, , \, \frac{3\pi}{2} \, , \, \frac{5\pi}{2} \, , \, ...$
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