The calculation of definite integrals is an important part of calculus.

In order to calculate the integral constant, it is necessary to solve the differential equation.

I studied calculus at university.

I am learning how to solve differential equations.

Differential geometry is a field of mathematics that studies geometric objects such as curves and surfaces using differential and integral calculus.

It's difficult to make sentences using infinitives.

His attendance is irregular.

His irregular attendance is disrupting the team's schedule.

He solved complex mathematical problems using his new calculator.

I am working using a spreadsheet software.