$\sin 47^{\circ}+\sin 61^{\circ}-\sin 11^{\circ}-\sin 25^{\circ}$ is equal to

Question

$(a)\;\sin 36^{\large \circ}\qquad(b)\;\cos 36^{\large\circ}\qquad(c)\;\sin 7^{\large\circ}\qquad(d)\;\cos 7^{\large\circ}$