Question

sin^2 30+sin^2 45+sin^2 60+sin^2 90

Answer 1

=sin^2 30+sin^2 45+sin^2 60+sin^2 90

= (1/√2)²+(1/2)²+(√3/2)²+(1)²

=(1/2)+(1/4)+(3/4)+1

=10/4

=5/2