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Given that 
x=3y^(3)+1, find 
(d)/(dy)(2x^(2)-2cos y) in terms of only 
y.
Answer:

Given that x=3y3+1 x=3 y^{3}+1 , find ddy(2x22cosy) \frac{d}{d y}\left(2 x^{2}-2 \cos y\right) in terms of only y y .\newlineAnswer:

Full solution

Q. Given that x=3y3+1 x=3 y^{3}+1 , find ddy(2x22cosy) \frac{d}{d y}\left(2 x^{2}-2 \cos y\right) in terms of only y y .\newlineAnswer:
  1. Express Function in Terms of y: First, we need to express the function 2x22cos(y)2x^2 - 2\cos(y) in terms of y using the given relationship x=3y3+1x = 3y^3 + 1. Substitute x=3y3+1x = 3y^3 + 1 into the function to get a new function of y.
  2. Substitute xx into Function: The new function in terms of yy is 2(3y3+1)22cos(y)2(3y^3 + 1)^2 - 2\cos(y). Now we need to find the derivative of this new function with respect to yy.
  3. Find Derivative of New Function: To find the derivative, we will use the chain rule for the term 2(3y3+1)22(3y^3 + 1)^2 and the basic derivative rule for the term 2cos(y)-2\cos(y). The derivative of 2cos(y)-2\cos(y) with respect to yy is 2sin(y)2\sin(y).
  4. Derivative of 2cos(y)-2\cos(y): Now, let's find the derivative of 2(3y3+1)22(3y^3 + 1)^2 with respect to yy. Let u=3y3+1u = 3y^3 + 1, then the term becomes 2u22u^2. The derivative of 2u22u^2 with respect to uu is 4u4u.
  5. Find Derivative of 2(3y3+1)22(3y^3 + 1)^2: Next, we need to find dudy\frac{du}{dy}, which is the derivative of u=3y3+1u = 3y^3 + 1 with respect to yy. The derivative of 3y33y^3 with respect to yy is 9y29y^2, and the derivative of 11 with respect to yy is 00. So, dudy\frac{du}{dy}00.
  6. Find dudy\frac{du}{dy}: Now, we apply the chain rule. The derivative of 2u22u^2 with respect to yy is 4ududy4u \cdot \frac{du}{dy}. Substitute u=3y3+1u = 3y^3 + 1 and dudy=9y2\frac{du}{dy} = 9y^2 into the equation to get 4(3y3+1)(9y2)4(3y^3 + 1)(9y^2).
  7. Apply Chain Rule: Simplify the expression 4(3y3+1)(9y2)4(3y^3 + 1)(9y^2) to get 36y2(3y3+1)36y^2(3y^3 + 1).
  8. Simplify Expression: Combine the derivatives of both terms to get the final derivative of the function with respect to yy. The final derivative is 36y2(3y3+1)+2sin(y)36y^2(3y^3 + 1) + 2\sin(y).

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