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`tan^(-1)((cosx - sinx)/(cosx + sinx)), - (pi)/(4)ltxlt(3pi)/(4)` को सरलतम रूप में लिखे |

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`tan^(-1)((cosx - sinx)/(cosx + sinx)), - (pi)/(4)ltxlt(3pi)/(4)` को सरलतम रूप में लिखे |
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`tan^(-1)((cosx -sinx)/(cosx + sinx)) = tan^(-1)((1-tanx)/(1+tanx))`
` = tan^(-1)((tan""(pi)/(4)-tanx)/(1+tan""(pi)/(4)*tanx)) = tan^(-1)tan((pi)/(4)-x) = (pi)/(4)-x`
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