Q. 3 B3.7( 10 Votes )
Prove the following identities.
LHS = +
We know that = cotθ and = tanθ.
⇒ + = +
= [ - ]
We know that a3 – b3 = (a – b) (a2 + ab + b2).
⇒ + = 
We know that sin2θ + cos2θ = 1.
⇒ + =
We know that = cosecθ and = secθ.
∴ ⇒ + = 1 + secθcosecθ = RHS
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