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If cos alpha = (-3)/5 and sin beta = 7/2...

If `cos alpha = (-3)/5` and `sin beta = 7/25` where `(pi)/2 lt alpha lt pi` and `0 lt beta lt (pi)/2` then find the values of `tan (alpha + beta) and sin (alpha + beta)`.

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The correct Answer is:
`-3//4 ,3//5`
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