Author Topic: C3 and C4 DOUBTS HERE!!!  (Read 36098 times)

Offline -Cornea

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Re: C3 and C4 DOUBTS HERE!!!
« Reply #165 on: January 21, 2012, 11:35:45 am »
do i need to know how to prove that sin(A+B)=sinA cosB + cosA sinB =D because i can't get it from the book =(
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Offline The Golden Girl =D

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Re: C3 and C4 DOUBTS HERE!!!
« Reply #166 on: January 21, 2012, 11:38:38 am »
Give me a couple of minutes to type it down ..Okies ;)

[ Will be editing so check after some time ]



My teacher told me that there is no need for me to know How to prove this but if it's the Opposite of what my teacher said then please do tell me how we rpove it (:

I hope I helped :D
« Last Edit: January 21, 2012, 11:41:37 am by GG »
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Offline -Cornea

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Re: C3 and C4 DOUBTS HERE!!!
« Reply #167 on: January 21, 2012, 01:06:48 pm »
and i need to ask if u know what marks should i get in order to score an A* in my AL's if u have an idea about this ,i'll be grateful =}
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Offline Malak

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Re: C3 and C4 DOUBTS HERE!!!
« Reply #168 on: January 21, 2012, 01:36:13 pm »
^It all depends on the grade boundary for that year.
But generally you need to get an A in AS in order to get an A* overall and ,I guess, you need like 90% or above in A2 to get an A*
summary: A in AS and 90% (or above) in A2 = A* overall  ::)
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Offline -Cornea

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Re: C3 and C4 DOUBTS HERE!!!
« Reply #169 on: January 22, 2012, 12:15:02 pm »
y = 2 – e?^-x iam really confused in these stuff should i multiply it -1 and then add 2 or should i multiply it by 1 only and add 2 then :s
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Offline Malak

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Re: C3 and C4 DOUBTS HERE!!!
« Reply #170 on: January 22, 2012, 12:54:04 pm »
y = 2 – e?^-x iam really confused in these stuff should i multiply it -1 and then add 2 or should i multiply it by 1 only and add 2 then :s
I dont understand the question :S
Can you be more clear? What does the question say?
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Offline The Golden Girl =D

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Re: C3 and C4 DOUBTS HERE!!!
« Reply #171 on: January 22, 2012, 12:58:34 pm »
Cornea ,if you're talking about how we Calculate the  y = 2 - e-x  USING the calculator then  Here is the Method :


You press shift on the ln button then Multiply it by -X , and THEN add 2 to it :)

I hope I helped (:
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Offline -Cornea

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Re: C3 and C4 DOUBTS HERE!!!
« Reply #172 on: January 22, 2012, 02:22:04 pm »
no i mean they asked me to sketch it :)
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Offline The Golden Girl =D

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Re: C3 and C4 DOUBTS HERE!!!
« Reply #173 on: January 22, 2012, 04:33:39 pm »
Cornea can you send me your e-mail ID via PMs cuz It seems my graph can't attach for some weird reason =/
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Offline -Cornea

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Re: C3 and C4 DOUBTS HERE!!!
« Reply #174 on: January 22, 2012, 04:48:28 pm »
done i sent you my email :D
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Offline Malak

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Re: C3 and C4 DOUBTS HERE!!!
« Reply #175 on: January 22, 2012, 07:58:53 pm »
Good luck everyone for C3 2morrow :D
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Offline Adzel

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Re: C3 and C4 DOUBTS HERE!!!
« Reply #176 on: February 23, 2012, 03:28:58 pm »
Solve for x :

4e^2x + 3e^x = 1

Anyone?  :-\
« Last Edit: February 23, 2012, 04:26:34 pm by Adzel »

Offline astarmathsandphysics

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Re: C3 and C4 DOUBTS HERE!!!
« Reply #177 on: February 24, 2012, 09:34:15 am »
Sub y=e^x then y^2=e^2x
4y^2+3y-1=0
(4y-1)(y+1)=0
so 4y-1=0 so y=1/4 so e^x =1/4 so x=ln(1/4)
or y+1=0 so y=-1 so e^x=-1 so x=ln(-1) no solution

Offline Adzel

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Re: C3 and C4 DOUBTS HERE!!!
« Reply #178 on: February 24, 2012, 07:03:11 pm »
I did the same thing, but in the answers; it has a solution and it's a negative number  ???

Offline astarmathsandphysics

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Re: C3 and C4 DOUBTS HERE!!!
« Reply #179 on: February 25, 2012, 08:54:47 am »
yes ln(1/4) is negative
-1.386