Mathematics: Post your doubts here!

[Haya Ahmed]

http://papers.xtremepapers.com/CIE/...S Level/Mathematics (9709)/9709_w09_qp_11.pdf

Q2 please someone draw the graph for me and explain .. because the answer is not given in the marking scheme thanks

 

[Talha Khatri]

Are you sure that is the method?

yes try it out, it will work inshaAllah

 

[Talha Khatri]

I dont find anything "degrading on this intellectual forum".But anyways i dont bother all this.Nice explanation .But my question is that the gradient of tangent and curve will be the same at that point ryt?.So how are u supposed to find the angle my friend?

LOL I am not even going to bother explaining this now, just re read what I explained, it is very clear. I'm talking about two different points here.

 

[ZaqZainab]

http://papers.xtremepapers.com/CIE/...S Level/Mathematics (9709)/9709_s13_qp_12.pdf
Q 5 part (ii) i got it till tanteth=-7 can you explain me after that thanks

 

[Thought blocker]

http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Mathematics (9709)/9709_w09_qp_11.pdf

Q2 please someone draw the graph for me and explain .. because the answer is not given in the marking scheme thanks

On the same graph, draw the line y = -x/2 + pi
When x = 0 y = pie, when x = 3 y = 1.64 now connect both the points

 

[Talha Khatri]

I dont understand the last step, the one right before the final answer..
How does the denominator finalize to become 1? I know that the numerator is the answer we're trying to reach, okay. But the denominator should be 1, now how does 1 + (tant) (tan 1/4pi) equate to 1? (tan 1/4pi) is equal to 1 not zero, so how did tant get cancelled off? Shouldn't it be, tant - (tan 1/4pi) / (tan 1/4pi) + tant ?
I don't think it's possible to substitute 1 with (tan 1/4pi) only in the numerator..

Please do explain.

I think you are forgetting the fact that tan (A-B) = (tan A - tan B) / (1+(tanA)*(tanB))
so the denominator was 1+tan t right?
so we can write this as 1+ (tant *1)
and now 1 = tan 0.25pi and we can substitute this without causing any problems to our equation
and this can be turned into tan (t-0.25pi)

 

[Thought blocker]

http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Mathematics (9709)/9709_s13_qp_12.pdf
Q 5 part (ii) i got it till tanteth=-7 can you explain me after that thanks

tan inverse -7 gives -81.86
add to 180 you get 98.1 degree
again add 180 you get is 278.1 degree

 

[Browny]

Thought blocker can you do me a favor please?

 

[Thought blocker]

Thought blocker can you do me a favor please?

ask

 

[Browny]

Can you give me the chemistry papers theory from 2000 to 2002 please?

 

[ZaqZainab]

tan inverse -7 gives -81.86
add to 180 you get 98.1 degree
again add 180 you get is 278.1 degree

Why did you add twice?

 

[Browny]

Can you give me the chemistry papers theory from 2000 to 2002 please?

ask

Can you give me the chemistry papers theory from 2000 to 2002 please?

 

[Thought blocker]

Why did you add twice?

Was this your doubt ? I too dont know, but by adding twice we get 2 degrees for this question. midha.ch help

 

[Thought blocker]

Can you give me the chemistry papers theory from 2000 to 2002 please?

Search 'em in google

 

[ZaqZainab]

Was this your doubt ? I too dont know, but by adding twice we get 2 degrees for this question. midha.ch help

yes that was my doubt i realized they added twize but i don't understand why >.<

 

[Thought blocker]

yes that was my doubt i realized they added twize but i don't understand why >.<

See the question again, Check the domain.

 

[ZaqZainab]

See the question again, Check the domain.

yeah :/ so like we don't add another extra 180 to have more answers in the domain

 

[Thought blocker]

yeah :/ so like we don't add another extra 180 to have more answers in the domain

we directly add 360 for second degree. Though I ain't sure.
Talha Khatri

 

[ZaqZainab]

we directly add 360 for second degree. Though I ain't sure.
@talah khatri

i have nearly done all the questions and only this one bothered me :/ why 360?

 

[Thought blocker]

i have nearly done all the questions and only this one bothered me :/ why 360?

*coughs* Talha Khatri