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int (-2)^(2)|x cos pi x |dx is equal to...

` int _(-2)^(2)|x cos pi x |dx` is equal to

A

`8/pi`

B

`4/pi`

C

`2/pi`

D

`1/pi`

Text Solution

Verified by Experts

The correct Answer is:
A
Let `l - int _(-2)^(2) | x cos pi x| dx = 2 = 2 int _(0)^(2) | x cos pix| dx `
`= 2 { int _(0)^(1/2) | x cos pi x | dx + int _(1/2)^(3/2) | x cos pi x | dx + int _(3/2)^(2)| x cos pi x | dx }`
` = 2 [ int _(0)^(1//2) cos pi xdx + int _(1//2)^(3/2) x cospi x dx + int _(3//2)^(2) x cos pi xdx]`
` = 2 [ [ (xsin pix)/pi + (cos pi x)/(pi^(2))]_(0)^(1//2) - [ (x sin pi x)/pi + (cos pi x)/(pi^(2))] _(1//2)^(3//2)`
` + [ (x sin pi x)/pi + (cos pix)/(pi^(2))]_(3//2)^(2)]`
` = 2 [ (1/(2pi)- 1/(pi^(2)))-((-3)/(2pi)-1/(2pi))+(1/(pi^(2))+3/(2pi)) ] ^(1//2) = 2 xx 8/(2pi) = 8/(pi)`
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MHTCET PREVIOUS YEAR PAPERS AND PRACTICE PAPERS-DEFINITE INTEGRALS-MHT CET Corner
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  3. int (0)^(pi //2)((root(n)(secx))/(root(n)(secx)+root(n)("cosec"x)))dx=

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  4. The value of int 0 ^ 1 x ^ 2 ( 1 - x ^ 2 ) ^ (3//2 ) dx ...

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  5. The value of int0^oox/((1+x)(x^2+1))dx is

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  6. Evaluate int(0)^(pi)(x dx)/(1+cos alpha sin x),where 0lt alpha lt pi.

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  7. int(pi//2)^(pi//2)(cosx)/(1+e^(x))dx is equal to

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  8. int(0)^(pi//2)(1)/((1+tanx))dx=?

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  9. If int(0)^(1) tan^(-1) x dx = p , then the value of int(0)^(1) tan^(-1...

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  10. The value of int (0)^(pi//2) log ("cosec "x) dx is

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  11. Which of the following is true ?

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  12. int(0)^(5) 1/((x-1)(x-2))dx is equal to

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  13. int(pi/4)^(pi/2) e^x(logsinx+cotx)dx

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  14. The value of int(0)^(pi) x sin^(3) x dx is

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  15. The value of int0 ^(pi/2) (cos3x+1)/(cosx - 1) dx is equal to

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  16. The value of underset(0)overset(1)int tan^(-1) ((2x-1)/(1+x-x^(2)))dx ...

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  17. If f is a continous function, then

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  18. The value of int(-pi)^(pi) sin^(3) x cos^(2) x dx is equal to

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  19. The value of int(-1)^(1) log ((x-1)/(x+1))dx is

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  20. int(pi//6)^(pi//3)(1)/((1+sqrt(tanx)))dx=(pi)/(12)

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  21. int (1)^(2)e^(x) (1/x - 1/(x^(2)))dx is qual to

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