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Given that 
u=3v^(4)+1, find 
(d)/(dv)(u^(2)-cos v) in terms of only 
v.
Answer:

Given that u=3v4+1 u=3 v^{4}+1 , find ddv(u2cosv) \frac{d}{d v}\left(u^{2}-\cos v\right) in terms of only v v .\newlineAnswer:

Full solution

Q. Given that u=3v4+1 u=3 v^{4}+1 , find ddv(u2cosv) \frac{d}{d v}\left(u^{2}-\cos v\right) in terms of only v v .\newlineAnswer:
  1. Express in terms of vv: First, we need to express u2cos(v)u^2 - \cos(v) in terms of vv using the given expression for uu.
    u=3v4+1u = 3v^4 + 1
    u2=(3v4+1)2u^2 = (3v^4 + 1)^2
    Now, we have u2cos(v)=(3v4+1)2cos(v)u^2 - \cos(v) = (3v^4 + 1)^2 - \cos(v)
  2. Find derivative of u2u^2: Next, we will find the derivative of u2u^2 with respect to vv. To do this, we will use the chain rule, which states that the derivative of a composite function is the derivative of the outer function evaluated at the inner function times the derivative of the inner function.\newlineLet's denote f(v)=u2f(v) = u^2 and g(v)=3v4+1g(v) = 3v^4 + 1. Then f(g(v))=(3v4+1)2f(g(v)) = (3v^4 + 1)^2.\newlineUsing the chain rule, we get:\newlineddv(u2)=ddu(u2)ddv(u)\frac{d}{dv}(u^2) = \frac{d}{du}(u^2) \cdot \frac{d}{dv}(u)\newline=2uddv(3v4+1)= 2u \cdot \frac{d}{dv}(3v^4 + 1)\newline=2u(12v3)= 2u \cdot (12v^3)\newline=24v3u= 24v^3 \cdot u
  3. Find derivative of cos(v)-\cos(v): Now, we need to find the derivative of cos(v)-\cos(v) with respect to vv.ddv(cos(v))=sin(v)\frac{d}{dv}(-\cos(v)) = \sin(v)
  4. Combine derivatives: We can now combine the derivatives to find the derivative of the entire expression u2cos(v)u^2 - \cos(v) with respect to vv.
    ddv(u2cos(v))=ddv(u2)+ddv(cos(v))\frac{d}{dv}(u^2 - \cos(v)) = \frac{d}{dv}(u^2) + \frac{d}{dv}(-\cos(v))
    = 24v3u+sin(v)24v^3 \cdot u + \sin(v)
  5. Substitute back into expression: Finally, we substitute uu back into the expression in terms of vv.
    u=3v4+1u = 3v^4 + 1
    ddv(u2cos(v))=24v3×(3v4+1)+sin(v)\frac{d}{dv}(u^2 - \cos(v)) = 24v^3 \times (3v^4 + 1) + \sin(v)
    =72v7+24v3+sin(v)= 72v^7 + 24v^3 + \sin(v)

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