# Tagged Questions

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### implicit differentiating equation with $\cos$

I need help getting $\frac{d^2y}{dx^2}$ for $y−\cos y=2x$ Someone answered and got $(1+\sin y(x))3+4\cos y(x)$ but i was unable to follow their steps and didnt get how to do it. any HELP?
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### The normal line intersects a curve at two points. What is the other point?

The line that is normal to the curve x^2 + xy - 2y^2 = 0 at (4,4) intersects the curve at what other point? I can not find an example of how to do this equation. Can someone help me out?
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### implicit differentiation using trigonometry functions

xcos(4x+3y)=ysinx I have been stuck on this problem for the longest. I have the answer but I don't know how to get to it. I have used the product and chain rule ...
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### Use implicit differentiation to find derivative

$$x\sin(4x+5y)=y\cos(x)$$ I am trying to use implicit differentiation to find dx/dy for this problem but the answer i keep getting is $$4x\cos(4x+5y)=-y\sin(x)$$ and I am stuck.
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### really hard calculus 1 problem. implicit [closed]

If $x^3 + y^3 = 26$, find the value of $d^2y/dx^2$ at the point (-1,3). The value at $d^2y/dx^2$ at the point $(-1,3)$ is _? (type a simplified fraction) I started out by finding the derivative of ...
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### Find derivative of a trig function.

If $y=\csc(xy)$, then find $y'$ in respect to $x$ $y'=-\csc(xy)\cdot \cot(xy)\cdot(xy)'$ $(xy)'=(x)'(y)+(x)(y)'$ $(xy)'=y+xy'$ $y'=-(y+xy')[\csc(xy)\cdot\cot(x)]$ AND, that's where I get lost. So ...