Math Help - a few calc problems i need help with

thanks tonio and skeeter for helping me with the other problem.

heres more problems i need help with T.T

Find derivative of:

y = cos^-1(x+y)

y = tan^-1(x+y)


Find Integrals of:

(sec(x)^4)/(sqrt(tanx)) dx

Originally Posted by bwong890

thanks tonio and skeeter for helping me with the other problem.

heres more problems i need help with T.T

Find derivative of:

y = cos^-1(x+y)

y = tan^-1(x+y)
[snip]

Re-write as x = cos(y) - y and x = tan(y) - y and find dx/dy in the usual way. Then dy/dx = 1/(dx/dy).

Originally Posted by bwong890

[snip]
Find Integrals of:

(sec(x)^4)/(sqrt(tanx)) dx

Substitute and then make the substitution .

If you need more help, please show all your work and say where you get stuck.