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  • 0 posts edited
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  • 54 votes cast
Aug
1
comment Short integral question
I mean we usualy did like this: $\frac{d}{dx}\sin\left(x^2\right) = \underbrace{\cos\left(x^2\right)}_{\frac{d}{dx}\sinqleft(x^2\right)} \cdot \underbrace{2x}_{\rlap{\text{derivative of what is inside the bracket}}}$ The Wolfram alpha confirms it wolframalpha.com/input/?i=d%2Fdx%20%5Csin(x%5E2)&t=crmtb01
Aug
1
comment Short integral question
But there is a rule that $d/dx ~[f(x)] = df(x)/dx \cdot dx/dx$ ... Why do we have such a rule if it doesnt apply for ALL the functions including exponential? Can anyone provide me a solution to this case?
Aug
1
comment Short integral question
Yes that is what i wanted to write. Where is the catch here???
Aug
1
asked Short integral question
Jul
25
comment How do i solve this square root to solve for $y$ and get rid of $x$ at the same time
The problem is quite large in fact. I was trying to keep it simple. The full problem is in fact posted in Physics stackexchange here: physics.stackexchange.com/questions/72253/…
Jul
25
comment How do i solve this square root to solve for $y$ and get rid of $x$ at the same time
I am supposed to get a $y$ but I don't know $x$. I hoped it is possible to get rid of it.
Jul
25
comment How do i solve this square root to solve for $y$ and get rid of $x$ at the same time
Yes I have. The problem is that above I cannot seem to factor out the 2.25...
Jul
25
asked How do i solve this square root to solve for $y$ and get rid of $x$ at the same time
Jul
16
comment Solving the trigonometric equation $A\cos x + B\sin x = C$
Are there no easier solutions?
Jul
16
asked Solving the trigonometric equation $A\cos x + B\sin x = C$
Jul
15
accepted Solving a simple quadratic equation
Jul
15
comment Solving a simple quadratic equation
Where does this formula come from?
Jul
15
asked Solving a simple quadratic equation
Jun
25
accepted Solving $L - L\sqrt{1-\frac{u^2}{C^2}} = u T$ for $u$
Jun
25
asked Solving $L - L\sqrt{1-\frac{u^2}{C^2}} = u T$ for $u$
Jun
19
accepted $\int\sin^2(Cx)\,dx$ from a manual - need proof
Jun
19
awarded  Yearling
Jun
19
comment $\int\sin^2(Cx)\,dx$ from a manual - need proof
Good point. Thank you!
Jun
19
asked $\int\sin^2(Cx)\,dx$ from a manual - need proof
Jun
12
accepted Solid angle definition - can it be seen shown using an image?