Thread: please help me to solve that questions

please any body help me

For #3, I'd try the ratio test. It works well with factorials and powers.

For #1, can you find the derivative of ?.

Try logarithmic differentiation.

I'll use x instead of theta for the sake of typing.







Differentiate:



Remember,

You can also use a useful rule.
where and is some function of "x" then,

When used with your problem gives the same result as galactus said.