How to find value of cos(-pi/2)?

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Answer 1 · 2018-02-23T10:48:02

$cos (- \frac{π}{2}) = 0$ $\cos (-\frac{\pi }{2})=0$

Remember that $cos$ $cos$ is an even function so that:

$cos (- x) = cos (x)$ $cos (-x)=cos(x)$

So by applying this property we have:

$= cos (\frac{π}{2})$ $=\cos (\frac{\pi }{2})$

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$= 0$ $=0$

That's it!