Just to be absolutely sure, let’s look at another slightly more complicated example but from now on I am not going to refer to it as “y=” because the functions are usually functions of x, therefore I will refer to them in this way:

Remember the rules above:



The example above highlights one of the simpler facets of integral calculus, that is the constant multiple rule. The constant multiple rule tells us that we can move a constant outside of the expression before we integrate:



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