Question

Sin18/sin72
Ka product

Answer 1

=sin2 72-cos2 18

=(cos 90-18)2 -cos2 18

=cos2 18-cos2 18

=0

Answer 2

$\frac{ \sin(18) }{ \sin(72) } = \frac{ \sin(90 - 18) }{ \sin(72) } = \frac{ \sin(72) }{ \sin(72 ) } = 1$

hence this will have solved by this way