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"What is calculus?" is a question many calculus students never learn the answer to!
Understanding what calculus is before you start learning how to use it will give you a better context for the whole course.
Calculus is the mathematical study of change, in the same way that geometry is the mathematical study of shape, or that trigonometry is the mathematical study of triangles.
Derivatives and integrals are the major concepts you'll learn in calculus. Derivatives allow you to find slope (rise over run), and integrals allow you to find area.
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