prove\:cos\left(7\frac{1}{2}\right)^{\circ }=\:\sqrt{6}+\sqrt{4}+\sqrt{3}+\sqrt{2}

prove\:cos\left(7\frac{1}{2}\right)^{\circ }=\:\sqrt{6}+\sqrt{4}+\sqrt{3}+\sqrt{2}

Prove that cos(7 1/2 ) degree= squareroot6+sq. root 4+sq.root 3+squ. root2