$\frac{1}{a}\int\frac{4x}{a+x^2}dx$
$\left(x^3+5x^3y^2\right)dx+e^{x^4}ydy$
$60+.2>40+0.3$
$3\sin-5\:=\:-2\sin$
$\int\left(1+3x\right)^7dx$
$\frac{8-4\sec^2x}{sec^2x}$
$4x^212xy^2+9^4$
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