How do you solve diffinit integrand on calculator?

To solve a definite integral on a calculator, first, access the integral function, often found under a "math" or "calculus" menu. Input the function you want to integrate, specify the lower and upper limits of integration, and then execute the command. The calculator will evaluate the integral and provide the numerical result. Make sure your calculator is in the correct mode (e.g., radians or degrees) if trigonometric functions are involved.