Question

can any one prove this​

Answer 1

Answer:

Consider LHS

sec^2 θ ( sec^2 θ - 1)

= sec^2 θ ( tan^2 θ). [sec^2 θ = tan^2 θ +1]

= (tan^2 θ +1) ( tan^2 θ). [sec^2 θ = tan^2 θ +1]

= tan^4 θ + tan^2 θ

Hence Proved

Hope it helps