$y'+2y=3e^{2x}$
$\tan\left(90+x\right)=-2$
$sin\left(6x\right)cos\left(9x\right)+cos\left(6x\right)sin\left(9x\right)$
$\cos^2\cdot x$
$10q+71=-59$
$x^2-7x-30<0$
$y'+\:y\:cot\left(x\right)\:=\:5e^{cos\left(x\right)}$
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