If $x=5(1-\sin t)$ and $y=5(t+\cos t)$, then $\frac{dx}{dy}=$
- A$\frac{\sin t-1}{\cos t}$
- B$\frac{\cos t}{\sin t-1}$
- C$\tan \frac{t}{2}$
- D$\frac{\cos(t/2)-\sin(t/2)}{\cos(t/2)+\sin(t/2)}$
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