$\frac{d}{dx}\sqrt{\frac{4-x^2}{4+x^2}}$
$\left(4x+3\right).\left(4x-3\right)$
$\frac{d}{dx}\sqrt{x+4y}=4x$
$4\left(sinx\right)^2=2$
$\left(9a-8\right)\left(9a+8\right)=81a^2+16$
$\frac{35}{7}\cdot7$
$\int_0^230.3\ln\left(x\right)dx$
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