? d/dxf(x)=lim_(h->0)(f(x+h)-f(x))/h
$$\frac{d}{d x} f ( x ) = \lim_{h \to 0} \frac{f ( x + h ) - f ( x )}{h}$$
? \frac{d}{dx}f(x)=\lim_{h\to 0}\frac{f(x+h)-f(x)}{h}
$$\frac{d}{d x} f ( x ) = \lim_{h \to 0} \frac{f ( x + h ) - f ( x )}{h}$$
? int_0^1f(x)dx
$$\int_0^1 f ( x ) d x$$
? int_0^(pi/2) sinx\ dx=1
$$\int_0^{\frac{\pi}{2}} \sin x \, d x = 1$$