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Integrals

Multiple Choice Questions

501.

The value of $\int_{0}^{4} |x - 1| dx$ is

$\frac{5}{2}$
5
4
1

502.
If I_n = $\int_{0}^{\frac{π}{4}} \tan^{n} (x) dx$ , where where n is apositive integer, then $I_{10} + I_{8}$ is

$\frac{1}{9}$

$\frac{1}{8}$

$\frac{1}{7}$

9

$\frac{1}{9}$

$Given integral is, I_{n} = \int_{0}^{\frac{π}{4}} \tan^{n} (x) dx I_{n} = \int_{0}^{\frac{π}{4}} \tan^{n - 2} (x) . \tan^{2} (x) dx = \int_{0}^{\frac{π}{4}} \tan^{n - 2} (x) . \sec^{2} (x) dx - \int_{0}^{\frac{π}{4}} \tan^{n - 2} (x) dx Put \tan (x) = t \Rightarrow \sec^{2} (x) dx = dt = \int_{0}^{1} t^{n - 2} dt - \int_{0}^{\frac{π}{4}} \tan^{n - 2} (x) dx = {[\frac{t^{n - 1}}{n - 1}]}_{0}^{1} - I_{n - 2} I_{n} + I_{n - 2} = \frac{1}{n - 1} Put n = 10, we et I_{10} + I_{8} = \frac{1}{9}$

503.

If I_n = $\int e^{x} [\frac{\sin (x) + \cos (x)}{1 - \sin^{2} (x)}] dx$ is

$(e^{x} . \csc (x)) + C$
$(e^{x} . \cot (x)) + C$
$(e^{x} . \sec (x)) + C$
$(e^{x} . \tan (x)) + C$

504.

When x > 0, then $\int \cos^{- 1} (\frac{1 - x^{2}}{1 + x^{2}}) dx$ is

$2 [{xtan}^{- 1} (x) - \log (1 + x^{2})] + C$
$2 [{xtan}^{- 1} (x) + \log (1 + x^{2})] + C$
$2 {xtan}^{- 1} (x) + \log (1 + x^{2}) + C$
$2 {xtan}^{- 1} (x) - \log (1 + x^{2}) + C$

505.

If the area between y = mx² and x = my² (m > 0) is 1/4 sq units, then the value of m is

$\pm 3 \sqrt{2}$
$\pm \frac{2}{\sqrt{3}}$
$\sqrt{2}$
$\sqrt{3}$

506.

$\int_{\frac{π}{6}}^{\frac{π}{3}} \frac{\sin^{3} (x)}{\sin^{3} (x) + \cos^{3} (x)} dx$ is equal to

$\frac{π}{2}$
$\frac{π}{3}$
$\frac{π}{12}$
$\frac{π}{6}$

507.

If [x] is the greatest integer function not greater than x, then $\int_{0}^{11} [x] dx$ is equal to

508.

If $n \in N$ and I_n = $\int {(\log (x))}^{n} dx$ , then I_n + nI_{n - 1} is equal to

$\frac{{(\log (x))}^{n + 1}}{n + 1}$
$x {(\log (x))}^{n} + C$
${(\log (x))}^{n - 1}$
$\frac{{(\log (x))}^{n}}{n}$

509.

$\int \frac{\cos^{n - 1} (x)}{\sin^{n + 1} (x)} dx (where, n \neq 0)$ is equal to

$\frac{\cot^{n} (x)}{n} + C$
$\frac{- \cot^{n - 1} (x)}{n - 1} + C$
$\frac{- \cot^{n} (x)}{n} + C$
$\frac{\cot^{n - 1} (x)}{n - 1} + C$

510.

$\int \frac{(x - 1) e^{x}}{{(x + 1)}^{3}} dx$ is equal to

$\frac{e^{x}}{(x + 1)} + C$
$\frac{e^{x}}{{(x + 1)}^{2}} + C$
$\frac{e^{x}}{{(x + 1)}^{3}} + C$
$\frac{{xe}^{x}}{(x + 1)} + C$

Previous Year Papers

Test Series

Test Yourself

Multiple Choice Questions

502. If In = ∫0π4tannxdx, where where n is apositive integer, then I10 + I8 is 19 18 17 9

502.
If I_n = $\int_{0}^{\frac{π}{4}} \tan^{n} (x) dx$ , where where n is apositive integer, then $I_{10} + I_{8}$ is

$\frac{1}{9}$

$\frac{1}{8}$

$\frac{1}{7}$

9