$\sqrt{1-4t^2}ds+2\sqrt{1-s^2}dt=0$
$\int\left(x^2+1\right)\cdot\sin\left(2x\right)dx$
$\left(5x^4-6y^3\right)^2$
$-5x-4=-19$
$\left(4m-14\right)^2$
$\frac{x}{\left(\frac{1}{cos}\right)}$
$\left(3m+2a\right)^3$
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