1.

Prove ...................

Answer»

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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