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ivanmlerner Group TitleBest ResponseYou've already chosen the best response.1
The opposite of derivative is integration, so in a you need to integrate once and on b, twice. Since the indefinite integral (with no limits of integration) gives you an arbitrary constant that disapears when you derivate, you need a way to find that constant because any number would satisfy the derivative formula since it would disapear when you derivated, thats why they give you one value of the function you want to find. Is it too confusing the way I explained or you got it?
 2 years ago

krypton Group TitleBest ResponseYou've already chosen the best response.0
b was the confusing one,so am to integrate tcosx 2twice?
 2 years ago

ivanmlerner Group TitleBest ResponseYou've already chosen the best response.1
Yes, because you are derivating twice, but then you get 2 arbitrary constants.
 2 years ago

krypton Group TitleBest ResponseYou've already chosen the best response.0
whats this for dy(0)/dx=2 what do i need it for?
 2 years ago

krypton Group TitleBest ResponseYou've already chosen the best response.0
my first integration i got txsin(x)+c
 2 years ago

ivanmlerner Group TitleBest ResponseYou've already chosen the best response.1
Your integration is fine and now you need to determine c, thats when you use dy(0)/dx=2, because by integrating once, you got dy/dx
 2 years ago

krypton Group TitleBest ResponseYou've already chosen the best response.0
so how do i use this dy(0)/dx=2?
 2 years ago

ivanmlerner Group TitleBest ResponseYou've already chosen the best response.1
txsin(x)+c=dy/dx so t*0sin(0)+c=2 Do you understand that?
 2 years ago

krypton Group TitleBest ResponseYou've already chosen the best response.0
so what about the y(0)=2?
 2 years ago

ivanmlerner Group TitleBest ResponseYou've already chosen the best response.1
you have dy/dx, but you want y, so you integrate again, and youll need this to find the other constant.
 2 years ago

ivanmlerner Group TitleBest ResponseYou've already chosen the best response.1
So, did you got the answer?
 2 years ago

krypton Group TitleBest ResponseYou've already chosen the best response.0
i will integrate this txsin(x)+c again?
 2 years ago

ivanmlerner Group TitleBest ResponseYou've already chosen the best response.1
because it is equal to dy/dx, and you want y
 2 years ago

krypton Group TitleBest ResponseYou've already chosen the best response.0
i got (tx^2/2)+cos(x)+c
 2 years ago

ivanmlerner Group TitleBest ResponseYou've already chosen the best response.1
you forgot to sonsider the constant of the previous integration
 2 years ago

ivanmlerner Group TitleBest ResponseYou've already chosen the best response.1
There will be two constants in this case, because its the second derivative.
 2 years ago

krypton Group TitleBest ResponseYou've already chosen the best response.0
cx+tx^2/2+cos(x)+c?
 2 years ago

ivanmlerner Group TitleBest ResponseYou've already chosen the best response.1
Yep thats it, but keep in mind that the c's are different, and the first one you should already have it as a number
 2 years ago

krypton Group TitleBest ResponseYou've already chosen the best response.0
the 1st one is 2 right?
 2 years ago

krypton Group TitleBest ResponseYou've already chosen the best response.0
ok thanks alot for your help :)
 2 years ago

ivanmlerner Group TitleBest ResponseYou've already chosen the best response.1
You are welcome
 2 years ago
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