Qualification > Math
[CIE] All Pure Mathematics (P1, P2 and P3) doubts here !
THEIGBOY:
can someone explain how to do questions like -->
question 5 paper 33 june 2010 part ii
and
question 3 paper 33 octover/nov 2010 part ii
and how to do question 10 on may june 2010 paper 33
Thank you very much
TJ-56:
Does anyone know why the root (-1\3) in question 10 (ii) in paper May June 2008 is rejected? The mark scheme just states that “Having rejected the root (-1\3) for a valid reason" lol, well what is this reason?
Thanx in advance.
leebux101:
can someone do ON03 q 7 iii)
arii!! where u at man!
we need ya here! =P
SkyPilotage:
--- Quote from: leebux101 on May 17, 2011, 09:31:55 pm ---can someone do ON03 q 7 iii)
arii!! where u at man!
we need ya here! =P
--- End quote ---
Its A circle with radius=2 units and center u.
SkyPilotage:
--- Quote from: TJ-56 on May 17, 2011, 09:11:18 pm ---Does anyone know why the root (-1\3) in question 10 (ii) in paper May June 2008 is rejected? The mark scheme just states that “Having rejected the root (-1\3) for a valid reason" lol, well what is this reason?
Thanx in advance.
--- End quote ---
That is because if you substitute t=-2 and t=-1/3 in the position vector of P ; the dot product of AP.AB should be +ve since the angle is acute.. If its -ve the angle is obtuse...Therefore if you use t=-2 you will get it +ve, and t=-1/3 will be -ve meaning obstuse angle which is incorrect..
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