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why cosx=cosx-cosx=cosx sinx=sinx-sinx=sinx

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moin ansari , 9 Years ago
Grade 11
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Vijay Mukati

Last Activity: 9 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 functionanti-symmtric about y -axis. Thanks.

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