下列化简不正确的是
A. $\cos 82^{\circ} \sin 52^{\circ}+\sin 82^{\circ} \cos 128^{\circ}=-\frac{1}{2}$
B. $\sin 15^{\circ} \sin 30^{\circ} \sin 75^{\circ}=\frac{1}{8}$
C. $\cos ^2 15^{\circ}-\sin ^2 15^{\circ}=\frac{\sqrt{3}}{2}$
D. $\frac{\tan 48^{\circ}+\tan 72^{\circ}}{1-\tan 48^{\circ} \tan 72^{\circ}}=\sqrt{3}$