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If tan theta = ( tan alpha + tan beta)/(...

`If tan theta = ( tan alpha + tan beta)/(1 + tan alpha tan beta),"show that " sin 2 theta =(sin 2 alpha + sin 2 beta)/(1+sin 2 alpha sin 2 beta)`

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The correct Answer is:
`= (sin 2 alpha + sin 2 beta)/(1 + sin 2 alpha sin 2 beta)`
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