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If cos(alpha+beta)=4/5; sin(alpha-beta)=...

If `cos(alpha+beta)=4/5; sin(alpha-beta)=5/13` and `alpha,beta` lie between `0&pi/4` then find the value of `tan2alpha`

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The correct Answer is:
`=(56)/(33)`.
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MARVEL PUBLICATION-TRIGONOMETRIC FUNCTIONS OF COMPOUND ANGLES AND FACTORIZATION FORMULAE-MCQs
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