$4x^2-8x-1=0$
$23-\frac{x}{4}=10$
$\cot\left(x\right)\cos\left(x\right)=\csc\left(x\right)$
$\left(3x^2-x+5\right)\left(x^2+3x-9\right)$
$cos^2x-sen^2x=1+4\cdot senx$
$\int\left[\left(3-x^2\right)e^{9x-x^3}\right]dx$
$\int\tan^{4}xdx$
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