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261.

$\int \frac{\sqrt{\tan (x)}}{\sin (x) \cos (x)} dx$ is equal to :

262.

$\int \frac{dx}{x^{2} + 4 x + 13}$ is equal to :

263.

$\int_{0}^{1} \frac{d}{dx} [\sin^{- 1} (\frac{2 x}{1 + x^{2}})] dx$ is equal to :

264.

$\int_{0}^{\frac{π}{2}} \frac{\sin (x)}{\sin (x) + \cos (x)} dx$ is equal to

265.

$\int \frac{\sin (x)}{\sin (x - α)} dx$ is equal to

266.

$\int 13^{x} dx$ is :

267.

$\int_{0}^{\frac{π}{2}} \sin (2 x) \log (\tan (x)) d x$

268.

$\int_{0}^{\frac{π}{2}} xsin (x) dx$ is equal to :

269.

$\int x^{2} {(ax + b)}^{- 2} dx$ is equal to :

$\frac{2}{a^{2}} (x - \frac{b}{a} \log (ax + b))$ + c
$\frac{2}{a^{2}} (x - \frac{b}{a} \log (ax + b)) - \frac{x^{2}}{a (ax + b)}$
$\frac{2}{a^{2}} (x + \frac{b}{a} \log (ax + b)) - \frac{x^{2}}{a (ax + b)} + c$
$\frac{2}{a^{2}} (x + \frac{b}{a} \log (ax + b)) - \frac{x^{2}}{a (ax + b)} + c$

270.

If f(t) is an odd function, then $\int_{0}^{x} f (t) dt$ is :