Question

solve pls fast............ ​

Answer 1

Solution--->

1) plzzz refer the attachment

2) We proceed by taking LHS and putting ,

x² = Cosθ

=> Cos⁻¹ x² = Cos⁻¹ ( Cosθ )

=> Cos⁻¹ x² = θ

3) Now using two formulee

CosA = 2Cos²A - 1

CosA = 1 - 2Sin²A

4) Dividing by Cosθ/2 in 7th step in each term of numerator and denominator

5) We know that

tan π / 4 = 1 , using it in , 9th step

6) We have a formula

tan ( A + B ) = tanA + tanB / ( 1 - tanA tanB )

Using it in 10th step and putting

θ = Cos⁻¹x² , we get RHS