Sin 90 - θ, cos 90 - θ formula
sin 90 - θ, cos 90 - θ formula
Last updated at April 16, 2024 by Teachoo
Question 1 Evaluate : (i) sin 18 /cos 72 sin 18 /cos 72 = sin 18 /cos (90 18 ) = sin 18 /(sin 18 ) = 1