2tan-¹(1+X/1-x)+sin-¹(1-x²/1+x²)PUT [email protected][email protected]=TAN-¹(x)now 2tan-¹([email protected]/[email protected])+sin-¹(1-tan²@/1+tan²@)2tan-¹(tan(π/[email protected])]+sin-1([email protected])=2(π/[email protected])+sin-¹(sin(π/[email protected])=π/[email protected]+π/[email protected]=2π/2=π
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