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If tan theta=(sinxcdot siny)/(cos x + ...

If ` tan theta=(sinxcdot siny)/(cos x + cos y)`
then prove that one of the values of
`tanfrac{1}{2}theta` is `tanfrac{1}{2}x. tanfrac{1}{2}y.`

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MBD PUBLICATION-TRIGONOMETRIC FUNCTIONS-QUESTION BANK
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