Integrals 4

Sine & Secant Substitution.

`Integrals Exercise 4.1:   `*Int((9-x^2)^(1/2)/x^2,x)

`Integrals Exercise 4.2:   `*Int(1/((x^2-4)^(1/2)),x)

`Integrals Exercise 4.3:   `*Int(x/(3-2*x-x^2)^(1/2),x)

`Integrals Exercise 4.4:   `*Int(x^3*(16-x^2)^(1/2),x)

`Integrals Exercise 4.5:   `*Int(1/(x^2*(25*x^2-9)^(1/2)),x)

`Integrals Exercise 4.6:   `*Int(exp(t)*(16-exp(2*t))^(1/2),t)

`Integrals Exercise 4.7:   `*Int(u^2*(a^2-u^2)^(1/2),u)

`Integrals Exercise 4.8:   `*Int((u^2-a^2)^(1/2),u)