$\cos \left(\cos ^{-1} \frac{1}{3}+\cos ^{-1} \frac{1}{5}\right)+\cos \left(\sin ^{-1} \frac{1}{3}+\sin ^{-1} \frac{1}{5}\right) =$ . . . . . . .
- A$0$
- B$\frac{\pi}{2}$
- C$\pi$
- D$\frac{\pi}{4}$
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