MCQ
$\int e ^x\left(\frac{\cos x-\sin x}{\sin ^2 x}\right) d x = .......$.
- ✓$– e^x cosec \ x + c$
- B$– e^x \cot \ x + c$
- C$e^x cosec \ x + c$
- D$ex \cot \ x + c$
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(velocity of sound in air = 340 m/s)