$12.65\cdot1$
$y'+\frac{4y}{x}=x^2-1$
$1^2-2$
$\frac{12x^3+10x^2+11x+9}{3x+1}$
$\left(\tan\left(x\right)\cdot\cot\left(x\right)\right)\sin\left(x\right)\cdot\cos\left(x\right)=1$
$\left(y-3x\right)^4$
$\frac{2\cot x}{1+\cot^2x}-2\sin x\cos x$
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