Question

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

Answer 1

$2( {sin15} + sin75)^{2}$
$2 ({sin(90 - 75) + sin75)}^{2}$
$2( {cos75} + sin75)^{2}$
$2 {cos75}^{2} + 2 {sin75}^{2} + 4sin75cos75$
$2(1) + 4(sin75cos75)$
$2 + 4 (sin75cos75)$