I have these 3 questions, and I think I need to use L'Hopitals rule. But I Have no idea how to go about that. Anything I've read about it confuses me.

a)

lim x->1 (ln x)/(x-1)

b) lim x-> infinity x/ln(1+2e^x)

c) lim x->0 (cot2x)(sin6x)

Please help