Mathematics: Post your doubts here!

[Ahmed Aqdam]

(i) Pythagoras → OT = 13, QT = 8 cm
Angle POQ = tan–1(12/5) = 1.176
S = rθ → 5.88
→ Perimeter = 25.9 cm

Hello I'm uploading a question of paper 1 of maths and it seems very accessable however some thought is missing as I can't solve it out. In the markscheme it says that tan^-1 (12/5) would give 1.176 and I don't understand this. Can someone explain me plzzz.

Set your calculator to radians.

 

[abruzzi]

http://papers.xtremepapers.com/CIE/...S Level/Mathematics (9709)/9709_s10_qp_31.pdf
Could someone please help me understand the solution of qn no. 8 (i and ii)? I just can't solve it.
Thanks

 

[ahmed abdulla]

can someone do the SECOND part of both questions ? TheZodiac

 

[TheZodiac]

http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Mathematics (9709)/9709_s10_qp_31.pdf
Could someone please help me understand the solution of qn no. 8 (i and ii)? I just can't solve it.
Thanks

Use the answer of the first part and then use the formula a^2 + b^2 to solve the next part.

 

[immie.rose]

Someone PLEASE help!
Thanks!

 

[TheZodiac]

http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Mathematics (9709)/9709_s10_qp_31.pdf
Could someone please help me understand the solution of qn no. 8 (i and ii)? I just can't solve it.
Thanks

Here, I solved it for you.

 

[TheZodiac]

Someone PLEASE help!
Thanks!

View attachment 36107

View attachment 36106

1)
dy/dx = e^2x+y
dy/dx = e^2x . e^y
e^-y dy = e^2x dx
Integrate
-1/e^y = e^2x/2 + c
put the values
c = -3/2
-1/e^y = e^2x/2 - 3/2
y = ln(-2/e^2x -3)

 

[TheZodiac]

Someone PLEASE help!
Thanks!

View attachment 36107

View attachment 36106

2) 1/1-y^2 dy = 1/x dx
Use partial fractions
1/(1+y)(1-y) = 1/x dx

I am sure you can solve it now?

 

[mania _ manal]

oct nov 2011 pp33 q6 http://papers.xtremepapers.com/CIE/...S Level/Mathematics (9709)/9709_w11_qp_33.pdf
may june 2012 q7 http://papers.xtremepapers.com/CIE/...S Level/Mathematics (9709)/9709_s12_qp_32.pdf
help will be appreciated ...

 

[TheZodiac]

can someone do the SECOND part of both questions ? TheZodiac

The first question I had already answered. However for second part, here's the solution:
x n+1 = √ (ln4+8(x)^2)
Place the value x1 = 2 in this above equation
= √ (ln4 + 8(2)^2)
Result would be x= 1.8930
Now place this in the place of 2 and you'd get result 1.8671, continue doing this until the answer gets stable upto 4 d.p
When you get it stable which would be 1.8585, place it in the equation given in part one and you'd get the answer y = 0.5

 

[abruzzi]

Here, I solved it for you.
View attachment 36125
View attachment 36126

Thank you soooo much!
Jazakallah

 

[TheZodiac]

(i) Pythagoras → OT = 13, QT = 8 cm
Angle POQ = tan–1(12/5) = 1.176
S = rθ → 5.88
→ Perimeter = 25.9 cm

Hello I'm uploading a question of paper 1 of maths and it seems very accessable however some thought is missing as I can't solve it out. In the markscheme it says that tan^-1 (12/5) would give 1.176 and I don't understand this. Can someone explain me plzzz.

tan^-1 (12/5) is 1.176. Your calculator must be in degree mode and you've to turn it into radian mode.

 

[snowbrood]

help bros answer x is less than -3 and greatr than -7/3

 

[Hassan Ali Abid]

View attachment 36231 help bros answer x is less than -3 and greatr than -7/3

 

[snowbrood]

??

 

[Hassan Ali Abid]

 

[snowbrood]

View attachment 36246

ok i got the roots -7/3 and -3 but how did u conclude that x is greater than -7/3 and less than -3

 

[yousef]

q-9(ii)
complex no.

 

[chishtyguy]

ok i got the roots -7/3 and -3 but how did u conclude that x is greater than -7/3 and less than -3

 

[yousef]

ok i got the roots -7/3 and -3 but how did u conclude that x is greater than -7/3 and less than -3

If you draw this on the number line //
you will find that the two roots go away from each other .
for eg when you get your answer as x>-2 and x<4
your answer will be -2>x>4 since when you draw the two roots above they coincide