Maths A level help!!!

How do you solve this question and explanation please!! my exam is in a few days time

For the first part use some type of interval bisection method.

For the second one, rearrange for $x^3$, then divide by x before square rooting both sides in order to arrive at the needed form, then explain how it converges onto the root.

I'm more interested in the first part. How do you get 2 and 3?

Pick an arbitrary interval, test the two ends, and cut it down using your intuition until you get the equation to change sign between two integers.

thanks very much. I've got a couple of other questions to ask if you don't mind it's just that i'm writing pure maths on monday and i'm revisiting all the problem questions i've encountered from past papers and you seem to be the only one giving valuable responses.

Go ahead and ask

this one?

the problem is finding a and b

Not really much of a problem. What do you think a and b are when it says "with parameter t" ?

1/cos^3t and tan^3t ?

Yep.

i'm failing to rearrange them to get the final equation

Show your attempt. Could be the part where you need to factor out a negative tan(t) and you do not switch both signs inside the bracket.

don't worry i've got it. i had to factor out tant and use some trigonometry identities so that the cos^2t cancels out. thanks a lot for the help.

Ah good, no problem.