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The cosine of $4$ equals $-0.653644$
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$\int-0.653644xdx$
Learn how to solve integral calculus problems step by step online. Find the integral int(cos(4)x)dx. The cosine of 4 equals -0.653644. The integral of a function times a constant (-0.653644) is equal to the constant times the integral of the function. Applying the power rule for integration, \displaystyle\int x^n dx=\frac{x^{n+1}}{n+1}, where n represents a number or constant function, in this case n=1. As the integral that we are solving is an indefinite integral, when we finish integrating we must add the constant of integration C.