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

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Answer 1 · 2018-02-23T10:48:02

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

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

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

So by applying this property we have:

#=\cos (\frac{\pi }{2})#

# #
# #

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# #
# #

#=0#

# #
That's it!