You can solve it without any kind of substitution, take a look at the integrand...
That's what I thought too as he hasn't taught us how to do this. He has taught us and stuff like that but if I do it that way, it doesn't give me a specific value. I look at the graph and it's apparent that the area should be zero, but yeah...must be a typo.
This is just Calc 1, have you seen problem/s like this before?