Tan inverse(cosx-sinx/cosx+sinx)
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Tan-¹ { Cosx { (1 - Tanx )/ Cosx ( 1 + Tanx}
=>
Tan-¹ { ( 1- Tanx ) / ( 1 + Tanx ) }
=>
Tan-¹ Tan{ π/4 - x }
=>
π/4 - x
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