3(b):
Derive the top and bottom and resubstitute t = 5.
3(c): Same as above
I didn't look at 3a because I'm too tired for Trig, but using L'Hospitals Rule makes them rather simple. If you can't do the derivatives, let me know.
http://www.maths.qmw.ac.uk/~klages/t...calc09_ex3.pdf
Q(3*) (a)
Thankyou