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Further Mathematics: Post your doubts here!

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Product of roots of a quartic equation.
Then explain that the positive root is taken as both tan pi/5 and tan2pi/5 are positive.
Are you talking about the part to deduce the roots of equation are.... ?
I know how to solve the last part 'Hence show that...' But not the 'deduce...'
I'm sorry I still don't get it. Could you explain further?
 
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Are you talking about the part to deduce the roots of equation are.... ?
I know how to solve the last part 'Hence show that...' But not the 'deduce...'
I'm sorry I still don't get it. Could you explain further?
Basically equate tan 5theta to 0, and reject any values than gives tan theta = 0 (0) as it is not the solution of the eqn intended.
Then find theta that with limits of (-pi, pi)
 
Messages
72
Reaction score
49
Points
28
Basically equate tan 5theta to 0, and reject any values than gives tan theta = 0 (0) as it is not the solution of the eqn intended.
Then find theta that with limits of (-pi, pi)
Oh I get it now! Wasn't that complicated after all. :LOL:

If you're free could you please help with more?
9231/11/ON/13
Q3. Express Ur in terms of r. I know how to express it but I don't know how to show it step by step or how to explain what I did to arrive at that answer. And how to justify it. I've read the marking scheme but still don't get it.
Q6. 'hence show that every solution of... has the form...' I don't understand the concept/theory here. Could you perhaps explain it briefly?

Sorry for asking so many questions. Thanks in advance!
 
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