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why -(cosx)=cosx -(sinx)=sinx

why -(cosx)=cosx 
-(sinx)=sinx

Grade:11

1 Answers

Vijay Mukati
askIITians Faculty 2590 Points
6 years ago
Actualy you make some mistake in writing the question. Actually it is cos(-x) = cos x and sin(-x) = sinx. This is because of cosx is a even function (symmtric about y-axis) and sinx is odd function(anti-symmtric about y -axis). Thanks.

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