Evaluate:`(-sqrt(-1))^31`

Evaluate : (1)/(3-sqrt(8)) -(1)/(sqrt(8)-sqrt(7))+(1)/(sqrt(7)-sqrt(6))-(1)/(sqrt(6)-sqrt(5))+(1)/(sqrt(5)-2).

Evaluate : int (sqrt(1-sqrt(x)))/(sqrt(1+sqrt(x)))dx

Evaluate: int(sqrt(a)-sqrt(x))/(1-sqrt(a x))\ dx

Evaluate: int1/(sqrt(x)(sqrt(x)+1))\ dx

Evaluate: int1/(sqrt(x)+sqrt(x+1))\ dx

Evaluate int(1)/(sqrt(x))(sqrt(x)+(1)/(sqrt(x)))^(2)dx

Evaluate: intdx/(sqrt (1+x^2)sqrt (log(x+sqrt (1+x^2))))

Evaluate: int1/(sqrt(1-sinx))\ dx

Evaluate: int1/(1+sqrt(x))dx

Evaluate: intsqrt((1-sqrt(x))/(1+sqrt(x)))dx