Qualification > Math
[CIE] All Pure Mathematics (P1, P2 and P3) doubts here !
Deadly_king:
--- Quote from: Ancestor on November 06, 2010, 05:29:09 am ---Chapter 10
Exercise 10 D
Q-1 (a) (i) and (ii)
try and tell me!!
Getting the answers, but not being confirmed with which are at the back.. :-\
--- End quote ---
Sorry for the late reply, I was busy in the science section.
Anyway it's obvious the answers from the book are not good. ;)
Let the length to be found be .
Using pythagoras theorem :
2 = 8.82 + (5,/3)2
2 = 77.44 + 75
2 = 3811/25 ----> = 1/5(,/3811)
sin theta = 8.8/, cos theta = (5,/3)/ and tan theta = (5,/3)/8.8
NOTE : ,/ stands for square root. ;D
Arthur Bon Zavi:
--- Quote from: Deadly_king on November 06, 2010, 05:53:35 am ---Sorry for the late reply, I was busy in the science section.
Anyway it's obvious the answers from the book are not good. ;)
Let the length to be found be .
Using pythagoras theorem :
2 = 8.82 + (5,/3)2
2 = 77.44 + 75
2 = 4311/25 ----> = 1/5(,/3811)
sin theta = 8.8/, cos theta = (5,/3)/ and tan theta = (5,/3)/8.8
NOTE : ,/ stands for square root. ;D
--- End quote ---
Yes, there is a printing mistake. Then I got same answers.
No logic has to be applied in this question, CIE is dumb. :D
Deadly_king:
--- Quote from: Ancestor on November 06, 2010, 05:58:54 am ---Yes, there is a printing mistake. Then I got same answers.
No logic has to be applied in this question, CIE is dumb. :D
--- End quote ---
Actually the book took to be 4,/3 but although is more or less equal to 4,/3, it is not exactly equal to 4,/3. ;D
Arthur Bon Zavi:
--- Quote from: Deadly_king on November 06, 2010, 06:01:40 am ---Actually the book took to be 4,/3 but although is more or less equal to 4,/3, it is not exactly equal to 4,/3. ;D
--- End quote ---
is equal to ,/152.44
What they took is not near to x's real value also.
X is 12.34
Then how can they take it as X = 6.92 ?
Deadly_king:
--- Quote from: Ancestor on November 06, 2010, 06:09:06 am --- is equal to ,/152.44
What they took is not near to x's real value also.
X is 12.34
Then how can they take it as X = 6.92 ?
--- End quote ---
I don't know. :-[
But according to its answers for sin, cos and tan, it seems they took 4,/3
Nevermind. Let's just forget about it. ;)
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