Evaluate `int_(0)^(infty) 5^(-x^2)dx`

Evaluate int_(0)^(infty) e^(-x)x^(3)dx .

The value of int_(0)^(infty)[2e^(-x)] dx (where ,[.] denotes the greatest integer function of x) is equal to S

Evaluate int_(0)^(a)(a^(2)x-x^(3))dx

The value of int _(0)^(infty)e-^(a^(2)x^(2)) dx is equal to

Evaluate: int_(0)^(3) x^(2) dx

Evaluate int_(0)^(2) |x^2-3x+2|dx

Evaluate int_(0)^(1)(2-3x+x^2)dx