Inline math: $\int f dx$

Display math \[ \int f dx \]

----> $U_A=\color{blue}{-U_D}-U_C$ <----

----> $U_A=\color{blue}{-U_D}-U_C$ <----

----> $U_A=\color{blue}{-U_D}-U_C$ <----

----> $U_A=\color{blue}{-U_D}-U_C$ <----

----> $U_A=\color{blue}{-U_D}-U_C$ <----