$\frac{d^2y}{dt^2}=0.5t-y$
$\cos\left(x\right)^4+\sin\left(x\right)^4+1=2\cos\left(x\right)^4$
$\frac{3x^2-2x^2+4x-10}{x+3}$
$\frac{\left(15x^5y^3z\right)}{\left(5x^2y\right)}$
$8r+12p-7-3p$
$u=\ln\left(5x^3\right)$
$6x^4-15x^3+21x^2$
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