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If ( sin ( theta + alpha ))/( cos ( thet...

If `( sin ( theta + alpha ))/( cos ( theta - alpha ))=(1- m)/(1+m) , " then " tan"((pi)/4- theta )= `

A

`m sin ""((pi)/4 - alpha )`

B

`m cos ""((pi)/4 + alpha )`

C

`m tan""((pi)//(4) + alpha ) `

D

`m cot""((pi)/4 - alpha ) `

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