$$ \int_0^\pi\left(\sin ^5 x \cos ^3 x+\sin ^4 x \cos ^4 x+\sin ^3 x \cos ^4 x\right) d x= $$
$\frac{873}{2240}$
$\frac{3 \pi}{128}+\frac{12}{35}$
$\frac{1641}{4480}$
$\frac{3 \pi}{128}+\frac{4}{35}$
$$ \int_0^1 \frac{x^4+1}{x^6+1} d x= $$
$\frac{\pi}{3}$
$\frac{\pi}{4}$
$\frac{\pi}{6}$
$\frac{\pi}{2}$
The area of the region (in sq units) bounded by the curves $x^2+y^2=16$ and $y^2=6 x$ is
$4 \pi+4 \sqrt{3}$
$\frac{2}{3}(4 \pi+\sqrt{3})$
$\frac{4}{3}(4 \pi+\sqrt{3})$
$\frac{4 \pi+\sqrt{3}}{3}$
If $a$ and $b$ are arbitrary constants, then the differential equation corresponding to the family of curves $y=\tan (a x+b)$ is
$\left(1+x^2\right) y_2-2 y y_1+y=0$
$\left(1+y^2\right) y_2-2 y y_1^2=0$
$\left(1+x^2\right) y_2+2 y y_1^2=0$
$\left(1+y^2\right) y_2-2 y y_1^2+y=0$
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