a*x² + b*x + c

a*sin(x) + b

a*x ^b

a*sin(x)*b*cos(x)

a*e^b*x

a*ln(x)

a*ln(x) / log₍₁₀₎

$U_R(t) = {|U_0| \cdot ({1 - e^{-{R \over L}t}})}$