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cos(x-y) = -1 show that cosx+ cos y=0 and sinx + siny=0
Dear Manoj
cos(x-y) = -1
that means
x-y = (2n+1)pi
x=y+(2n+1)pi
apply cos on both sides
cos x = cos(y+(2n+1)pi)
=> cosx = -cosy
=> cos x + cos y = 0
in the same way sinx+siny = 0
Please feel free to post as many doubts on our discussion forum as you can.we will get you the answer and detailed solution very quickly.
All the best. Regards,Askiitians ExpertsPrudhvi Teja
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