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

1 Answer
Feb 23, 2018

\cos (-\frac{\pi }{2})=0cos(π2)=0

Explanation:

Remember that coscos is an even function so that:

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

So by applying this property we have:

=\cos (\frac{\pi }{2})=cos(π2)


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=0=0


That's it!