How do junior high school students learn calculus? What kind of problems can calculus solve in junior high school mathematics?

Look at the definition and formula of calculus and know its application, such as:

Differential is first used to find the slope of the tangent of the curve, and it can also study the monotonicity, minimax sum of functions.

Concave and convex; Integral can be used to find the area surrounded by straight lines or curves on a plane. In addition, calculus plays a great role in learning knowledge of various disciplines (such as physics) and solving practical problems (such as optimization problems).

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