00:01
In this question, we are asked to calculate the given definite integral.
00:04
And the first step is to calculate the indefinite integral of each function inside the integral.
00:13
The integral of 2t squared equals to 2 multiplied by t cube over 3 plus c.
00:23
The integral of 2e to the t is a table integral and equals to 2 multiplied by e to the t plus c.
00:30
The integral of 1 over t dt is the standard integral and equals to ln of the absolute value of t plus c.
00:41
And to calculate the integral of 2 cos 6t, we'll need to use a u substitution.
00:49
We'll choose u to be equal to 6t, then du equals to 6 dt.
00:57
That means that dt equals to du over 6.
01:05
And after the substitution, we'll get the integral of 2 multiplied by cos u, and du gets replaced by, dt gets replaced by du over 6.
01:17
We'll get one third times the integral of cos u du.
01:24
And recall that the integral of cosine equals to sine.
01:27
So we'll get one third sine u plus c.
01:32
And remembering that u equals to 6t, we'll get one third sine of 6t plus c.
01:40
Now we can calculate the original integral.
01:44
So recall that each, we calculated the integral of each function inside the integral...