Question
Differentiate the following functions with respect to x:
$\frac{\sin\text{x}-\text{x}\cos\text{x}}{\text{x}\sin\text{x}+\cos\text{x}}$
$\frac{\sin\text{x}-\text{x}\cos\text{x}}{\text{x}\sin\text{x}+\cos\text{x}}$
$\frac{\text{d}}{\text{dx}}\Big(\frac{\sin\text{x}-\text{x}\cos\text{x}}{\text{x}\sin\text{x}+\cos\text{x}}\Big)$
Using quotient rule, we get
$\frac{(\text{x}\sin\text{x}+\cos\text{x})\frac{\text{d}}{\text{dx}}(\sin\text{x}-\text{x}\cos\text{x})-(\sin\text{x}-\text{x}\cos\text{x})\frac{\text{d}}{\text{dx}}(\text{x}\sin\text{x}+\cos\text{x})}{(\text{x}\sin\text{x}+\cos\text{x})^2}$
$=\frac{(\text{x}\sin\text{x}+\cos\text{x})\Big\{\cos\text{x}-\Big(\frac{\text{dx}}{\text{dx}}\cos\text{x}+\cos\text{x}\frac{\text{dx}}{\text{dx}}\Big)\Big\}-(\sin\text{x}-\text{x}\cos\text{x})\Big(\frac{\text{dx}}{\text{dx}}\sin\text{x}+\sin\text{x}\frac{\text{dx}}{\text{dx}}\Big)+\frac{\text{d}}{\text{dx}}\cos\text{x}}{(\text{x}\sin\text{x}+\cos\text{x})^2}$
$=\frac{(\text{x}\sin\text{x}+\cos\text{x})(\cos\text{x}+\text{x}\sin\text{x}-\cos\text{x})-(\sin\text{x}-\text{x}\cos\text{x})(\text{x}\cos\text{x}+\sin\text{x}-\sin\text{x})}{(\text{x}\sin\text{x}+\cos\text{x})^2}$
$=\frac{(\text{x}\sin\text{x}+\cos\text{x})\text{x}\sin\text{x}-(\sin\text{x}-\text{x}\cos\text{x})\text{x}\cos\text{x}}{(\text{x}\sin\text{x}+\cos\text{x})^2}$
$=\frac{\text{x}^2\sin^2\text{x}+\text{x}\sin\text{x}\cos\text{x}-\text{x}\sin\text{x}\cos\text{x}+\text{x}^2\cos^2\text{x}}{(\text{x}\sin\text{x}+\cos\text{x})^2}$
$=\frac{\text{x}^2(\sin^2\text{x}+\cos^2\text{x})}{(\text{x}\sin\text{x}+\cos\text{x})^2}\ (\because\sin^2\text{x}+\cos^2\text{x}=1)$
$=\frac{\text{x}^2}{\text{x}\sin\text{x}+\cos\text{x}}$
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
| Class | 0-10 | 10-20 | 20-30 | 30-40 | 40-50 |
| Frequency | 5 | 10 | 20 | 5 | 10 |