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Hi I'm having trouble in trigonometric identities, can someone please help me with this question:
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Mathematics: Post your doubts here!
- Thread starter XPFMember
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Hello,
could you help me please? I'm having a hard time with number 5 (iii). I have got 2sec^2X - 1 - 2 secXtanX. There is a sign problem.
:$
Please help me.
could you help me please? I'm having a hard time with number 5 (iii). I have got 2sec^2X - 1 - 2 secXtanX. There is a sign problem.
:$Please help me.
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( s+c ) ( 1 - s c )
Expand the brackets:
s + c - s^2 c - s c^2
Using identities s^2 + c^2 =1
s + c - (1 - c^2 )c - s(1-s^2)
Do the calculations, it'd give the required form.
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could you help me please? I'm having a hard time with number 5 (iii). I have got 2sec^2X - 1 - 2 secXtanX. There is a sign problem.
Please help me.
Similar to the question above that one, you'd simply have to expand ( sec + tan ) ^2
sec^2 + 2sectan + tan^2
sec^2 + 2sectan + sec^2 - 1
What's the problem?
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Thank you so much.........I had not link that part with the question above. Thank you. <3 ^^
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You're welcome. : )
http://papers.xtremepapers.com/CIE/...S Level/Mathematics (9709)/9709_w11_qp_12.pdf
Guys, number 7 ii and 8ii pls. Thanx!..
Guys, number 7 ii and 8ii pls. Thanx!..
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As for 7ii)
You have the derivative of the equation, also known as "y dash". To get the original curve you simply need to integrate. So...
5 becomes 5x and -8/x^2 becomes +8/x. However, there is the constant of integration, so the final thing is. y = 5x + 8/x + c.
Point P is on the curve thus it satisfies the curve's equation. Substitute with its coordinates to find c.
As for 8ii)
First you find the intersections with the x-axis ( By putting y = 0 ). Those will be the limits of integration. The volume needed has a specific formula which is PI *int(y^2 dx)
y^2 = 8x - x^2
int ( 8x - x^2 dx ) = 4x^2 - x^3 / 3
Substitute with the limits and don't forget to multiply by PI.
Thanx a lot!
...However , I didn't understand something.The required volume is pi*y^2*dx....so before we integrate, dont we square the equation 8x -x^2????
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Thanx a lot!
The equation itself is root(8x-x^2) so when it is squared, the root is just omitted and that's it.
I em nd u?
hmm i am thinking of giving maths p3 and m1 in NOV but still tired from June exams :/
The equation itself is root(8x-x^2) so when it is squared, the root is just omitted and that's it.
Thanx a lot!
..btw..cn u solve 10 ii?
http://papers.xtremepapers.com/CIE/...S Level/Mathematics (9709)/9709_w12_qp_12.pdf
Oh i c..which subjects did u give in may???How ws it?
All good except maths p1 :/
Tsk..em also scared for that....p1 ans s1..did u give s1?
yeah :/ but i messed up
uh oh...dats so disappointing...When did u finish your syllabus and when did u start practicing past papers?