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Given that 
v=4y^(4)-5, find 
(d)/(dy)(3y^(3)-5sin v) in terms of only 
y.
Answer:

Given that v=4y45 v=4 y^{4}-5 , find ddy(3y35sinv) \frac{d}{d y}\left(3 y^{3}-5 \sin v\right) in terms of only y y .\newlineAnswer:

Full solution

Q. Given that v=4y45 v=4 y^{4}-5 , find ddy(3y35sinv) \frac{d}{d y}\left(3 y^{3}-5 \sin v\right) in terms of only y y .\newlineAnswer:
  1. Find Derivative with Chain Rule: First, we need to find the derivative of the function 3y35sin(v)3y^3 - 5\sin(v) with respect to yy. 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 times the derivative of the inner function. In this case, the outer function is 3y35sin(u)3y^3 - 5\sin(u) (where uu is a function of yy), and the inner function is v=4y45v = 4y^4 - 5.
  2. Differentiate Outer Function: We start by differentiating the outer function with respect to uu, treating uu as the variable. The derivative of 3y33y^3 with respect to uu is 00, since it does not contain the variable uu. The derivative of 5sin(u)-5\sin(u) with respect to uu is 5cos(u)-5\cos(u). So, the derivative of the outer function with respect to uu is 5cos(u)-5\cos(u).
  3. Differentiate Inner Function: Next, we need to differentiate the inner function v=4y45v = 4y^4 - 5 with respect to yy. The derivative of 4y44y^4 with respect to yy is 16y316y^3, and the derivative of 5-5 with respect to yy is 00. Therefore, the derivative of vv with respect to yy is 16y316y^3.
  4. Apply Chain Rule: Now, we apply the chain rule by multiplying the derivative of the outer function with respect to uu by the derivative of the inner function with respect to yy. This gives us the derivative of 3y35sin(v)3y^3 - 5\sin(v) with respect to yy as 5cos(v)16y3-5\cos(v) \cdot 16y^3.
  5. Express Derivative in Terms of y: Finally, we need to express the derivative in terms of yy only. Since v=4y45v = 4y^4 - 5, we substitute vv back into our expression for the derivative. This gives us the final derivative as 5cos(4y45)×16y3-5\cos(4y^4 - 5) \times 16y^3.

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