Write the value of 
.
Consider 4 tan2 θ – 
= 4 tan2 θ – 4 sec2 θ
= 4(tan2 θ – sec2 θ)
= 4( – 1) (∵1 + tan2 θ = sec2 θ)
= – 4
14
Write the value of .
Consider 4 tan2 θ – = 4 tan2 θ – 4 sec2 θ
= 4(tan2 θ – sec2 θ)
= 4( – 1) (∵1 + tan2 θ = sec2 θ)
= – 4