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In calculus (a branch of mathematics), a differentiable function of one real variable is a function whose derivative exists at each point in its domain.
Calculus is the study of differentiation and integration. Trigonometry is the study of triangles. In the simplest senses: Differentiation is to find the tangent of a curve. Integration is to find the area under a curve. Written Mar 27, 2014 Â· View Upvotes.