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If "tan"(alpha+theta)=n "tan"(alpha-thet...

If `"tan"(alpha+theta)=n "tan"(alpha-theta)`,ahow that:
`(n+1)"sin"2 theta=(n-1)"sin"2alpha`

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Solution ( Principle & General Solution ) || General form ( tan theta = tan alpha, cos theta = cos alpha , sin theta = sin alpha)

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