Question

sinsquare 5 + sinsquare 30 + sinsquare45 + sinsquare75=​

Answer 1

(sin15)^2+(sin30)^2+(sin45)^2+(sin75)^2

=(cos75)^2+(sin75)^2+1/2+3/4

=1+1/2+3/4

=3/2+3/4

=9/4.

hope it is the answer