I'm stuck on several questions that are driving me round the bend. If you can help with any it would be greatly appreciated.

a)Integral of: 1/sqrtx(2+sqrtx).dx = ln 16, between the values of 36 and 0 and where the substitution is x=u^2

or

b)Integral of: cos^2(t)sin(t).dt, between the values of pi/2 and pi/3 where u = cos(t)

sorry if it is hard to understand but I am new to this and don't understand how to insert the proper maths lingo and symbols.

Thanks Beard