Evaluate `int_(1)^(infty) e^(-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

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

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

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

6.Evaluate int_(0)^(1)(e^(x)+x^(e))dx

Evaluate: int(x+1)^(2)e^(x)dx