XAT 2023 Trigonometry — Previous Year Question

Find the value of $\dfrac{\sin^{6}15^\circ + \sin^{6}75^\circ + 6\sin^{2}15^\circ\sin^{2}75^\circ}{\sin^{4}15^\circ + \sin^{4}75^\circ + 5\sin^{2}15^\circ\sin^{2}75^\circ}$