\frac{1}{\sqrt{4 π κ t}} \exp (- \frac{x^{2}}{4 \frac{κ}{C_{p}} t})

${\frac{1}{\sqrt{4 \pi \kappa t}} \exp \bigg( -\frac{x^2}{4 \frac{\kappa}{C_p} t} \bigg)}$

Error