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Khan Academy offers multivariable calculus, which is the same as calculus 3. You can view it here: https://www.khanacademy.org/math/multivariable-calculus. There are also other …
AP Calculus BC covers Calculus 1 and 2 and is more rigorous. Differential and Integral Calculus are two different types of calculus. Multivariable Calculus, Differential Equations, and Linear Algebra are very advanced courses that are taken after Calculus 1 and 2.
These are all very powerful tools, relevant to almost all real-world applications of calculus, especially in physics. There are many ways to extend the idea of integration to multiple dimensions: some examples include Line integrals, double …