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cos(x-y) = -1  show that cosx+ cos y=0  and sinx + siny=0

6 years ago


Answers : (1)


Dear Manoj

cos(x-y) = -1 

that means

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.
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Prudhvi Teja

6 years ago

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