$12\cdot4-15-3$
$\frac{d}{dx}\left(y=cos\left(4e^{3x}\right)\right)$
$\left(2x-3\right)\left(5-4x\right)-78x-\left(7x-4\right)^2$
$\frac{x^7}{x^{15}}$
$\frac{dz}{dt}\left(z=x^2+y^2\right)\left(x=t^3\right)\left(y=1+t^2\right)$
$\int_{64}^{\infty}dx$
$x^2+25+156.25$
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