Maths-

General

Easy

Question

# If x sin x dx = – =

- sin x + c
- cos x + c
- x cos x + c
- cos x – sin x + c.

Hint:

### Using formula where u and v are functions of x . Find the value of x sin x dx and compare it with given value to find value of alpha.

## The correct answer is: sin x + c

### Given ,x sin x dx let u = x and v = sin x

then ,

Using formula

Using formula,

Comparing - x cos x + sin x + c with – = sin x + c

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