The great importance of calculus is quickly noticed by taking a look at the number of fields that use calculus to solve important problems. Calculus is used to solve from biology problems to economy problems.

Problems monitoring the dynamical changes of biological samples, all kind of optimization problems or economical problems involving the interest rate need calculus to be solved.

Besides the significant aspect that this part of mathematics helps in development of an analytical mathematical thinking, calculus proves its effectiveness by solving real, practical problems.

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I think maybe we need to take a wider view on subjects such as calculus rather than focusing upon their direct application. Surely, all learning is beneficial in terms of what it teaches us about expanding our horizons and our brains. Therefore, even though we may not use calculus for anything in our lives, I think we need to fight against the temptation of considering that any learning is wasted.

I remember taking calculus in college. I can honestly say that I studied every minute of the day. It was a challenge and my brain definitely received a work out. I believe any subject that makes you think is good for you. The more you use your brain, your intellectual reasoning, the better prepared you are in life. I teach my students that learning something new is as if you are building the brain as you would build the body in a workout. It is important to focus on the learning and not be put off by not seeing the need for the subject. While you are learning, your brain is being strengthened.