Methods/steps

1. Step 1: Find and open the calculator on your mobile phone.

2. Step 2: Find the "calculator" function as shown in the figure in the general calculator.

3. Step 3: After entering the calculator, select the scientific calculator.

4. Step 4: Only the tan function as shown in the figure, and continue to click the fx function as shown in the figure.

5. Step 5: When fx becomes the inverse function, find the arctangent function.

6. Step 6: Click the arctangent function and display it on the calculator.