Evaluate the integrals in Exercises 31–78.
73. ∫dx/√(-2x-x²)

Each of Exercises 19–24 gives a formula for a function y=f(x) and shows the graphs of f and f^(-1). Find a formula for f^(-1) in each case.

f(x)=x²+1, x≥0

In Exercises 21–48, find the derivative of y with respect to the appropriate variable.

43. y=√(arcsin x)

"In Exercises 59–86, find the derivative of y with respect to the given independent variable.

67. y = 7^(sec θ) ln 7"

In Exercises 21–48, find the derivative of y with respect to the appropriate variable.

45. y=cos(x-arccos(x))

Solve the differential equation in Exercises 9–22.

9. 2√(xy) (dy/dx) = 1, x, y > 0

Solve the differential equation in Exercises 9–22.

19. y²(dy/dx) = 3x²y³ - 6x²