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If theta - phi=pi/4, prove that : (1 +...

If `theta - phi=pi/4`, prove that :
`(1 + tan theta)(1-tan phi)=2`.

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MODERN PUBLICATION-TRIGNOMETRY-EXERCISE
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  2. If theta+phi=45^@, prove that (cot theta-1) (cot phi-1) =2.

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  3. If theta - phi=pi/4, prove that : (1 + tan theta)(1-tan phi)=2.

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  4. If theta - phi=pi/4, prove that : (1 + tan theta)(1+tan phi)=2 tan ...

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  19. Prove that : cos theta- sin theta= sqrt2 cos (theta+ pi/4).

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  20. Prove that : tan (x-y)+tan (y -z) + tan (z-x)= tan (x-y)tan (y -z) t...

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