4 sin 15^{0} cos15^{0} ( cos^{2} - sin^{2} 15^{0}

Question

4 sin 15^{0} cos15^{0} ( cos^{2} - sin^{2} 15^{0}

Answer 1

 4 sin 15^{0} cos15^{0} ( cos^{2} - sin^{2} 15^{0} =2sin30cos30=sin60=√3/2