Question

2 whole bracket sin 15 degree + sin 75 degree bracket close whole square

Answer 1

Hi friend!!

Given,

2(sin15+sin75)²

We know that sin75=sin(90-15)=cos15

→2(sin15+cos15)²

=2(sin²15+cos²15+2sin15cos15)

we know that sin²A+cos²A=1 and 2sinAcosA=sin2A

→2(1+sin30)

we know that sin30=1/2

=2(1+1/2)

=2(3/2)

=3

I hope this will help you;)