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Given that 
v=2y^(4)-5, find 
(d)/(dy)(4v^(2)-cos y) in terms of only 
y.
Answer:

Given that v=2y45 v=2 y^{4}-5 , find ddy(4v2cosy) \frac{d}{d y}\left(4 v^{2}-\cos y\right) in terms of only y y .\newlineAnswer:

Full solution

Q. Given that v=2y45 v=2 y^{4}-5 , find ddy(4v2cosy) \frac{d}{d y}\left(4 v^{2}-\cos y\right) in terms of only y y .\newlineAnswer:
  1. Express in terms of y: First, we need to express 4v24v^2 in terms of yy using the given expression for vv.\newlinev=2y45v = 2y^4 - 5\newlinev2=(2y45)2v^2 = (2y^4 - 5)^2\newline4v2=4(2y45)24v^2 = 4(2y^4 - 5)^2
  2. Find derivative of 4v24v^2: Now, we will find the derivative of 4v24v^2 with respect to yy. Using the chain rule, the derivative of 4v24v^2 with respect to yy is 2×4v×dvdy2 \times 4v \times \frac{dv}{dy}. Since v=2y45v = 2y^4 - 5, dvdy=ddy(2y45)=8y3\frac{dv}{dy} = \frac{d}{dy}(2y^4 - 5) = 8y^3. Therefore, the derivative of 4v24v^2 with respect to yy is 4v24v^200.
  3. Simplify derivative expression: Next, we simplify the expression for the derivative of 4v24v^2 with respect to yy. \newline2×4×(2y45)×8y3=64y3×(2y45)2 \times 4 \times (2y^4 - 5) \times 8y^3 = 64y^3 \times (2y^4 - 5)
  4. Find derivative of cos(y)-\cos(y): Now, we find the derivative of cos(y)-\cos(y) with respect to yy. The derivative of cos(y)-\cos(y) with respect to yy is sin(y)\sin(y).
  5. Combine derivatives: Finally, we combine the derivatives of 4v24v^2 and cos(y)-\cos(y) to find the derivative of the entire expression with respect to yy. \newline(ddy)(4v2cos(y))=64y3(2y45)+sin(y)(\frac{d}{dy})(4v^2 - \cos(y)) = 64y^3 * (2y^4 - 5) + \sin(y)
  6. Express final answer: We express the final answer in terms of yy.(ddy)(4v2cos(y))=128y7320y3+sin(y)(\frac{d}{dy})(4v^2 - \cos(y)) = 128y^7 - 320y^3 + \sin(y)

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