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If A-B=pi//4 , then (1+t a n A)(1-t a n ...

If `A-B=pi//4` , then `(1+t a n A)(1-t a n B)` is equal to a.`2` b. `1` c. `0` d. `3`

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Given,

`A + B = π/4`

Taking `“tan”` on both sides,

`tan(A + B) = tan π/4`

...
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