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C2 DOUBT edexcel

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halosh92:
a circle with centre O and radius 6 cm.
the  chord PQ divides the circle into a minor segemnt R1 of area A1
and  a major segment R2 of area A2. the chord PQ subtends an angle thita radians at O/
a) show that A1= 18 (thita- sin thita)
 given that A2= 3A1 and f(thita) = 2 thita - 2sin thita - pie
b) prove that f(thita)=0
c) evaluate f(2.3) and f(2.32) and deduce that 2.3<thita>2.32

how to do part b  and c
??
thxxx

AS panic attack:
can sme one solve this ques

the coefficient of x3 in the epansion of (2+x)(3-ax)4 is 30
find the values of the constant a.

please show step by step working
Thanks

halosh92:

--- Quote from: AS panic attack on April 16, 2010, 12:24:15 pm ---can sme one solve this ques

the coefficient of x3 in the epansion of (2+x)(3-ax)4 is 30
find the values of the constant a.

please show step by step working
Thanks

--- End quote ---

a=1
a= sqrt 30
 is this the answer? if not post the correct answer please :)

AS panic attack:
A=1, (5+or-sqrt 105)/8

please show workings i need to know how to get da ans

Thanks

Amr Fouad:
give me 2 mins

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