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Show that `tan^(-1)[(cosx+sinx)/(cosx-sinx)]=(pi)/(4)+x`.

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in Trigonometry by (123k points)
Show that `tan^(-1)[(cosx+sinx)/(cosx-sinx)]=(pi)/(4)+x`.
A. `-x`
B. `x`
C. `(pi)/(4)-x`
D. `(pi)/(4)+x`
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Correct Answer - D
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