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"If" (sin ( theta + varphi))/(cos ( thet...

`"If" (sin ( theta + varphi))/(cos ( theta - varphi))= (1-x)/(1+x), "show that" tan( pi/4 - theta)tan( pi/4 - varphi) = x`

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The correct Answer is:
`= tan(pi/4 - varphi)tan (pi/4 - theta)`
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