Write the following trigonometric expression in terms of sine and cosine. Express your answer in terms of $x$ only.
$\frac{1+\tan (-x)}{\cot (-x)}$

• A. $-\frac{(\sin x\cdot \cos x+{\sin }^{2}x)}{{\cos }^{2}x}$ ​
• B. $-\frac{(\sin x\cdot \cos x-{\sin }^{2}x)}{{\cos }^{2}x}$
• C. $-\frac{(\sin x\cdot \cos x-\sin x)}{{\cos }^{2}x}$
• D. $-\frac{(\sin x\cos x-{\sin }^{2}x)}{\cos x}$