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Integral Calculus – I Important Questions

12th Standard

    Reg.No. :
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Business Maths

Time : 01:00:00 Hrs
Total Marks : 50
    5 x 1 = 5
  1. \(\frac { { e }^{ x } }{ { e }^{ x }+1 } \) dx is _______.

    (a)

    log\(\left| \frac { { e }^{ x } }{ { e }^{ x }+1 } \right| +c\)

    (b)

    log\(\left| \frac { { e }^{ x }+1 }{ { e }^{ x } } \right| +c\)

    (c)

    log\(\left| { e }^{ x } \right| +c\)

    (d)

    log\(\left| { e }^{ x }+1 \right| +c\)

  2. \(\left[ \frac { 9 }{ x-3 } -\frac { 1 }{ x+1 } \right] \)dx is _______.

    (a)

    \(log\left| x-3 \right|-log \left| x+1 \right| +c\)

    (b)

    \(log\left| x-3 \right|+log \left| x+1 \right| +c\)

    (c)

    \(9log\left| x-3 \right|-log \left| x+1 \right| +c\)

    (d)

    \(9log\left| x-3 \right|+log \left| x+1 \right| +c\)

  3. \(\frac { 2x+3 }{ \sqrt { x^{ 2 }+3x+2 } } \) dx is _______.

    (a)

    \(\sqrt { x^{ 2 }+3x+2 } \) + c

    (b)

    \(2​​\sqrt { x^{ 2 }+3x+2 } +c\)

    (c)

    log(x2 + 3x + 2)+ c

    (d)

    \(\frac{2}{3}\left(x^{2}+3 x+2\right)^{\frac{3}{2}}+c\)

  4. \(\int { \frac { 2 }{ { \left( { e }^{ x }+{ e }^{ -x } \right) }^{ 2 } } } \) dx = ____________ +c 

    (a)

    \(\frac { { -e }^{ -x } }{ { e }^{ x }+{ e }^{ -x } } \)

    (b)

    \(-\frac { { -e }^{ -x } }{ { e }^{ x }+{ e }^{ -x } } \)

    (c)

    \(\frac { 1 }{ { \left( { e }^{ x }+1 \right) }^{ 2 } } \)

    (d)

    \(\frac { 1 }{ { e }^{ x }-{ e }^{ -x } } \)

  5. \(\int { { e }^{ x } } \) (1-cot x +cot2 x) dx = _______________ +c

    (a)

    ex cot x

    (b)

    - ex cot x

    (c)

    ex cosec x

    (d)

    -ex cosec x

  6. 5 x 2 = 10
  7. Integrate the following with respect to x.
    \(\frac { 8x+13 }{ \sqrt { 4x+7 } } \)

  8.  Integrate the following with respect to x.
    \(\frac { 1 }{ \sqrt { x+1 } +\sqrt { x-1 } } \)

  9. Evaluate \(\int { \frac { 2{ cos }^{ 2 }x-cos2x }{ { sin }^{ 2 }x } } \)

  10. Evaluate \(\int _{ 0 }^{ \pi }{ { sin }^{ 2 } } x\ dx\)

  11. If \(\int _{ 0 }^{ a }{ { 3x }^{ 2 } } dx=8\) find the value of a

  12. 5 x 3 = 15
  13. Evaluate \(\int { \frac { x+2 }{ \sqrt { 2x+3 } } } dx\)

  14. Evaluate \(\int { \frac { 1 }{ \sqrt { x+2 } -\sqrt { x-2 } } } dx\)

  15. Evaluate \(\int { \frac { 1 }{ \sqrt { { 16x }^{ 2 }+25 } } } dx\)

  16. Evaluate ഽex \(\left( \frac { 1+sinxcosx }{ { cos }^{ 2 }x } \right) dx\)

  17. Evaluate \(\int _{ 1 }^{ 2 }{ \frac { log\quad x }{ { x }^{ 2 } } } dx\)

  18. 4 x 5 = 20
  19. Evaluate ∫(2sin x − 5cos x)dx

  20. Evaluate \(\int { { sin }^{ 2 }xdx } \)

  21. Evaluate \(\int _{ 0 }^{ \frac { \pi }{ 4 } }{ sin } 3xsin\ 2x\ dx\)

  22. Prove that \(\int _{ a }^{ b }{ \frac { f\left( x \right) }{ f\left( x \right) +f(a+b-x) } } dx=\frac { b-a }{ 2 } \)

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