The equation of a straight line passing through $(1,2)$ and having intercept of length 3 between the straight lines $3 x+4 y=24$ and $3 x+4 y=12$ is
$7 x+24 y-55=0$
$24 x+7 y-38=0$
$24 x-7 y-10=0$
$7 x-24 y+41=0$
The differential equation for all family of line which are at a unit distance from the origin is
$\left[y-x \frac{d y}{d x}\right]^2=1-\left[\frac{d y}{d x}\right]^2$
$\left[y-x \frac{d y}{d x}\right]^2=1+\left[\frac{d y}{d x}\right]^2$
$\left[y+x \frac{d y}{d x}\right]^2=1+\left[\frac{d y}{d x}\right]^2$
$\left[y+x \frac{d y}{d x}\right]^2=1-\left[\frac{d y}{d x}\right]^2$
If $[x]$ denotes the integral part of $x$ and $k=\sin ^{-1}\left(\frac{1+t^2}{2 t}\right)>0$, then number of values of $\alpha$ for which the equation $(x-[k])(x+\alpha)-1$ has integral roots
1
4
2
None of these
$\int \frac{e^{x^2}\left(2 x+x^3\right)}{\left(3+x^2\right)^2} d x$ is equal to
$\frac{e^{x^2}}{\left(3+x^2\right)}+c$
$\frac{1}{4} \frac{e^{x^2}}{\left(3+x^2\right)}+c$
$\frac{1}{8} \frac{e^{x^2}}{\left(3+x^2\right)}+c$
$\frac{1}{2} \frac{e^{x^2}}{\left(3+x^2\right)}+c$
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