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If phi is the exterior angle of a regula...

If `phi` is the exterior angle of a regular polygon of `n` sides and `theta` is any constant then prove that `sintheta+sin(theta+phi)+sin(theta+2phi)+...` upto `n` terms`=0`

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MOTION-TRIGNOMETRIC RATIOS & IDENTITIES -Exercise -3
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  17. in triangle ABC, tan A + tan B + tan C=

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