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Given that 
x=w^(5)+5, find 
(d)/(dw)(3x^(2)+3cos w) in terms of only 
w.
Answer:

Given that x=w5+5 x=w^{5}+5 , find ddw(3x2+3cosw) \frac{d}{d w}\left(3 x^{2}+3 \cos w\right) in terms of only w w .\newlineAnswer:

Full solution

Q. Given that x=w5+5 x=w^{5}+5 , find ddw(3x2+3cosw) \frac{d}{d w}\left(3 x^{2}+3 \cos w\right) in terms of only w w .\newlineAnswer:
  1. Express xx in terms of ww: First, we need to express xx in terms of ww to be able to differentiate the function with respect to ww. We are given that x=w5+5x = w^5 + 5. We will use this to differentiate the function 3x2+3cos(w)3x^2 + 3\cos(w) with respect to ww.
  2. Apply chain rule: Next, we need to apply the chain rule to differentiate 3x23x^2 with respect to ww. The chain rule 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. In this case, the outer function is 3u23u^2 (where u=xu = x) and the inner function is x=w5+5x = w^5 + 5.
  3. Derivative of xx with respect to ww: The derivative of 3u23u^2 with respect to uu is 6u6u. So, the derivative of 3x23x^2 with respect to xx is 6x6x. Now we need to multiply this by the derivative of xx with respect to ww, which is the derivative of ww00 with respect to ww.
  4. Multiply derivatives: The derivative of w5w^5 with respect to ww is 5w45w^4, and the derivative of a constant (5)(5) is 00. Therefore, the derivative of xx with respect to ww is 5w45w^4.
  5. Substitute xx into expression: Now we can multiply the derivative of 3x23x^2 with respect to xx by the derivative of xx with respect to ww to get the derivative of 3x23x^2 with respect to ww. This gives us 6x×5w46x \times 5w^4.
  6. Differentiate 3cos(w)3\cos(w): Substituting x=w5+5x = w^5 + 5 into 6x5w46x \cdot 5w^4, we get 6(w5+5)5w46(w^5 + 5) \cdot 5w^4. This simplifies to 30w4(w5+5)30w^4(w^5 + 5).
  7. Combine derivatives: Now we need to differentiate 3cos(w)3\cos(w) with respect to ww. The derivative of cos(w)\cos(w) with respect to ww is sin(w)-\sin(w). Therefore, the derivative of 3cos(w)3\cos(w) with respect to ww is 3sin(w)-3\sin(w).
  8. Combine derivatives: Now we need to differentiate 3cos(w)3\cos(w) with respect to ww. The derivative of cos(w)\cos(w) with respect to ww is sin(w)-\sin(w). Therefore, the derivative of 3cos(w)3\cos(w) with respect to ww is 3sin(w)-3\sin(w).Finally, we add the derivatives of 3x23x^2 and 3cos(w)3\cos(w) with respect to ww to get the derivative of the entire function with respect to ww. This gives us ww22.

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