Question

1. Evaluate :
sin 18°/
cos 72°​

Answer 1

Answer:

sin = cos( 90-18)

=cos72

so,sin18/cos72

cos72/cos72=1

Answer 2

Cos=Sin (90-theta)
=Sin(90-72)
Sin18
So, sin18/cos72
Sin18/Sin 18 =1