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0 < A ,B < pi/4 ,cos (A+B) =4/5, s...

`0 < A ,B < pi/4 ,cos (A+B) =4/5, sin (A-B) =5/13 => tan 2A=` (i)`16/63` (ii)`56/33` (iii)`1/65` (iv)`45/77`

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