In step 1th, open the Word2010 document window and switch to the Insert Ribbon. Click the formula button (not the Formula Drop-down button) in the symbol group, as shown in Figure 1.
Figure 1 Click the formula button
Step 2nd, create a blank formula frame in the Word2010 document, and in the formula Tools/Design Ribbon, click the Integral button in the structure group. Select the appropriate integral form in the list of open integration structures, as shown in Figure 2.
Figure 2 Select Integral form
Step 3rd, insert the integral structure in the blank formula frame, click the integral Structure placeholder box and enter a specific value or formula symbol, as shown in Figure 3.
Figure 3 Input Integral formula concrete value