$\:10\:=\:\frac{2}{5}\left(-10x-5\right)$
$\cos a+\sin a\cdot\tan a=\sec a$
$cos^2x\left(\frac{1}{cos^2x}-1\right)$
$\int_0^{\frac{\pi}{4}}\left(cos^27xsin^27x\right)dx$
$2xy+3xy-xy$
$35,6\sqrt{4}$
$7+83,96+35,76$
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