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Prove that :(cosx-cosy)^2+(sinx-siny)^2=...

Prove that :`(cosx-cosy)^2+(sinx-siny)^2=4sin^2((x-y)/2)`.

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OSWAAL PUBLICATION-SAMPLE PAPER 8-EXERCISE
  1. Let R be the relation over the set N xx N and is defined by (a,b)R(c,d...

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  2. Let R be the relation over the set N xx N and is defined by (a,b)R(c,d...

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  3. Prove that :(cosx-cosy)^2+(sinx-siny)^2=4sin^2((x-y)/2).

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