$\frac{dz}{da}=-\frac{b}{a}$
$\frac{8^7}{4^7}$
$\left(\sec^2\left(x\right)-1\right)^{\cos\left(x\right)}$
$4x^{2}+3xy=11$
$\left(y+cot\frac{y}{x}\right)dx-xdy=0$
$12-4\cdot\left(\frac{15}{5}\right)^2$
$\sqrt{25-\left(-4\right)\left(-4\right)}$
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