Noto Sans Math

Using your system font:

Γ (t) = \int_{0}^{+ ∞} x^{t - 1} e^{- x} d x = \frac{1}{t} \prod_{n = 1}^{∞} \frac{{(1 + \frac{1}{n})}^{t}}{1 + \frac{t}{n}} \sim \sqrt{\frac{2 π}{t}} {(\frac{t}{e})}^{t}

Using a Web font:

Γ (t) = \int_{0}^{+ ∞} x^{t - 1} e^{- x} d x = \frac{1}{t} \prod_{n = 1}^{∞} \frac{{(1 + \frac{1}{n})}^{t}}{1 + \frac{t}{n}} \sim \sqrt{\frac{2 π}{t}} {(\frac{t}{e})}^{t}