`int_(0)^(oo)e^(-x/2)dx`

Evaluate :int_(0)^(oo)e^(-x)dx

Evaluate the following definite integrals: int_(0)^(oo)e^(-x)dx

Evaluate the following : int_(0)^(oo)x^(-1//2)dx

Evaluate: int_(0)^(oo)[2e^(-x)]dx, where [x] represents greatest integer function.

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

int_(0)^(oo)[2e^(-x)]dx , where [.] deontes greatest integer function, is equal to

underset is If int_(0)^(oo)e^(-ax)dx=(1)/(a), then int_(0)^(oo)(x^(n))e^(-ax)dx