If 
then show that f(tanθ) = sin 2θ.
Given: 
Need to prove: f(tanθ) = sin 2θ
⇒ 
[as 1 + tan2 θ = sec2 θ]
⇒ 
[as 
and 
]
⇒ 
[Proved]
1
If then show that f(tanθ) = sin 2θ.
Given:
Need to prove: f(tanθ) = sin 2θ
⇒ [as 1 + tan2 θ = sec2 θ]
⇒ [as and ]
⇒ [Proved]