definite integral calculation

Hello
How to write definite integral of f(x) wrt x.

example: integral(f(x)*dx, 0, 1/2)
thanks

integrate(dnorm, -1.96, 1.96)
#> 0.9500042 with absolute error < 1e-11

Created on 2020-03-18 by the reprex package (v0.3.0)

Supplying your function in place of dnorm

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