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Need HELP for CIE AS Maths P1

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The SMA:
Hi guys  :), i have a doubt on the O/N 2008 paper 1, question 9 (iii). How do you find the acute angles? Please help. Thanks in advance  ;D

nid404:
In 5 hrs...im on the phone

anthonychy:
Hi there,the answer for your question is 19.4 degree.

Here's the solution,
Initially, you differenciate the equation then substitute x=0 and x=1 which is the two points P and Q.
Now find the angle using this two gradients. (use tan [gradient of each]) you should get 56.3 degree and 36.9 degree.
Finally, find the difference of the angles. Done.

The SMA:

--- Quote from: anthonychy on April 19, 2010, 08:31:51 am ---Hi there,the answer for your question is 19.4 degree.

Here's the solution,
Initially, you differenciate the equation then substitute x=0 and x=1 which is the two points P and Q.
Now find the angle using this two gradients. (use tan [gradient of each]) you should get 56.3 degree and 36.9 degree.
Finally, find the difference of the angles. Done.

--- End quote ---

Ahhhh..Finally i got the answers! Thank you very much anthonychy  :)
but did you mean use (tan inverse [dy/dx]) for x=0 and x=1 right :P?
i already got the answer though. thanks  ;D

The SMA:
hey guys ;),
i have more doubts from the O/N 2008 paper 1.
its Q5, how do we relate maximum/minimum values to the given function?
is it from graph or something?

and Q10 (ii), i don't know how to prove max. value of gf(x)=9.
Can someone help me step by step?

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