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If t a nalpha=5/2, tanbeta=-7/9 where a...

If `t a nalpha=5/2`, `tanbeta=-7/9` where `alpha in [pi/2,pi]` , then `alpha+beta` lies in the interval. `[(3pi)/2,(7pi)/3]` (b) `[(13pi)/6,(5pi)/2]` `[(13pi)/6,(7pi)/3]` (d) `[pi/6,pi/3]`

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