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IGCSE MATHS Doubts

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Fastal:

--- Quote from: Adzel on May 11, 2010, 06:11:25 pm ---58

--- End quote ---

can you tell me why please??

Malak:
Nov 09 Q 4 & 14 http://www.freeexampapers.us/IGCSE/Maths/CIE/2009%20Nov/0580_w09_qp_22.pdf

Thx alot

Shazizzzle:

--- Quote from: Fastal on May 11, 2010, 06:20:34 pm ---can you tell me why please??

--- End quote ---

DCA = DAT (Alternate Segment Theory)

If DAO = 32, DAT = 90 - 32 = 58.

So, DCA = 58. :)

Dibss:

--- Quote ---58

can you tell me why please??
--- End quote ---

hey, I'm assuming you know the alternate segment theorem which says the angle between a tangent and a chord drawn form the point of contact is equal to any angle in the alternate segment.
in your qs, DAT will be equal to any angle subtended by line AD in the opposite segment. therefore angle DAT=ACD=58 :]

Shazizzzle:

--- Quote from: ang3l on May 11, 2010, 06:21:59 pm ---Nov 09 Q 4 & 14 http://www.freeexampapers.us/IGCSE/Maths/CIE/2009%20Nov/0580_w09_qp_22.pdf

Thx alot

--- End quote ---

Umm, separate the coeffecients from the variables.

i.e First do 5/8 /  1/2
=5/8 X 2/1 (reciprocal of 1/2 taken when introducing multiplication)
=10/8
1/1/4.

Then the variables.

x^3/2  /  x^-5/2
=x^ 3/2 - (-5/2)
=x^3/2+5/2
=x^8/2
=x^4

So, Answer: 1/1/4x^4 :)

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