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I=int(cos4x+1)/(cotx-tanx)dx is equal to...

`I=int(cos4x+1)/(cotx-tanx)dx` is equal to ?

A

`(1)/(2)In|sec2x|-(1)/(4)cos^(2)2x+c`

B

`(1)/(2)In|sec2x|+(1)/(4)cos^(2)x+c`

C

`(1)/(2)In|cos2x|-(1)/(4)cos^(2)2x+c`

D

`(1)/(2)In|cos2x|+(1)/(4)cos^(2)x+c`

Text Solution

Verified by Experts

The correct Answer is:
C
`I=int(cos4x-1)/(cotx-tanx)dx=int(-2sin^(2)2x(sinxcosx))/((cos^(2)x-sin^(2)x))dx`
`=-int(sin^(2)2xsin2x)/(cos2x)x`
`=int((cos^(2)2x-1)sin2x)/(cos2x)dx`
`"Let " t=cos2x " or "dt=-2sin2xdx`
` :. I=(1)/(2)int((1-t^(2)))/(t)dt=(1)/(2)In|t|-(t^(2))/(4)+C `
`=(1)/(2)In|cos2x|-(1)/(4)cos^(2)2x+c`
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CENGAGE PUBLICATION-INDEFINITE INTEGRATION-EXERCISES (Single Correct Answer Type)
  1. Evaluate the following Integrals : int (sec x .dx)/(sqrt(sin (2x+A...

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  2. int(cos2x)/((e^(-x)+cosx)sqrt(1+sin2x))dx,x in(0,(pi)/(2)) is equal t...

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  3. I=int(cos4x+1)/(cotx-tanx)dx is equal to ?

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  4. If int(dx)/(x^2(x^n+1)^((n-1)/n))=-(f(x))^(1/n)+C then f(x) is (...

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  5. int sqrt((cosx-cos^3x)/(1-cos^3x))dx is equal to

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  6. intx(lna^(a^(x/2))/(3a^((5x)/2)b^(3x))+(lnb^(b^x))/(2a^(2x)b^(4x)))dx(...

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  7. int(3+2cosx)/((2+3cosx)^2)dx is equal to (a) ((sinx)/(3cosx+2))+c ...

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  8. "If " (d)/(dx)f(x)=f'(x), " then " int(xf'(x)-2f(x))/(sqrt(x^(4)f(x)))...

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  9. The value of the integral int((1-costheta)^(2/7))/((1+costheta)^(9/7))...

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  10. If int(dx)/(sqrt(sin^3xcos^5x))=asqrt(cotx)+bsqrt(tan^3)x+c , then a=-...

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  11. Ifint(dx)/(cos^3xsqrt(sin2x))=a(tan^2x+b)sqrt(tanx)+c ,t h e n a=(sq...

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  12. Evaluate: int dx/( (x + 2)(x^2 + 1) )

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  13. Ifint(3e^x-5e^(-x))/(4e^x+5e^(-x))dx=a x+bln(4e^x+5e^(-x))+C ,t h e n ...

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  14. If intf(x)sinxcosxdx=1/(2(b^2-a^2))lnf(x)+c ,then f(x) is equal to

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  15. int(x^(5))/((4x^(2)+ 1)^(4))dx is equal to

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  16. If int1/(xsqrt(1-x^3))dx=alog|(sqrt(1-x^3)-1)/(sqrt(1-x^3)+1)|+b ,t h...

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  17. The value of the integral int(x^2+x)(x^(-8)+2x^(-9))^(1/(10))dx is 5/(...

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  18. int(x^3dx)/(sqrt(1+x^2))i se q u a lto 1/3sqrt(1+x^2)(2+x^2)+C 1/3...

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  19. If I=int (dx)/((a^(2)-b^(2)x^(2))^(3//2)), then I equals

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  20. int(x^4-1)/(x^2sqrt(x^4+x^2+1))dx= (a) sqrt(x^2+1/(x^2)+1)+C (b) (...

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