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Given that 
x=4w^(2)+4, find 
(d)/(dw)(x^(4)-5sin w) in terms of only 
w.
Answer:

Given that x=4w2+4 x=4 w^{2}+4 , find ddw(x45sinw) \frac{d}{d w}\left(x^{4}-5 \sin w\right) in terms of only w w .\newlineAnswer:

Full solution

Q. Given that x=4w2+4 x=4 w^{2}+4 , find ddw(x45sinw) \frac{d}{d w}\left(x^{4}-5 \sin w\right) in terms of only w w .\newlineAnswer:
  1. Expand x4x^4: First, we need to express x45sin(w)x^4 - 5\sin(w) in terms of ww using the given expression for xx. We have x=4w2+4x = 4w^2 + 4. To find x4x^4, we need to raise the expression for xx to the fourth power.
  2. Calculate x4x^4: We calculate x4x^4 by raising (4w2+4)(4w^2 + 4) to the fourth power. This involves expanding the binomial (4w2+4)4(4w^2 + 4)^4 using the binomial theorem or by multiplying the expression by itself four times. However, since we are ultimately interested in the derivative with respect to ww, we can simplify our work by differentiating directly without fully expanding the binomial.
  3. Chain rule for x4x^4: The derivative of x4x^4 with respect to ww can be found using the chain rule. 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 u4u^4 (where u=xu = x) and the inner function is x(w)=4w2+4x(w) = 4w^2 + 4.
  4. Combine derivatives: Using the chain rule, we differentiate x4x^4 with respect to xx and then multiply by the derivative of xx with respect to ww. The derivative of x4x^4 with respect to xx is 4x34x^3. The derivative of xx with respect to ww is the derivative of 4w2+44w^2 + 4, which is xx00.
  5. Differentiate 5sin(w)-5\sin(w): Now we combine the two derivatives to find the derivative of x4x^4 with respect to ww: (ddw)(x4)=4x3(ddw)(x)=4x38w=32wx3(\frac{d}{dw})(x^4) = 4x^3 * (\frac{d}{dw})(x) = 4x^3 * 8w = 32wx^3.
  6. Sum of derivatives: Next, we need to differentiate 5sin(w)-5\sin(w) with respect to ww. The derivative of 5sin(w)-5\sin(w) with respect to ww is 5cos(w)-5\cos(w).
  7. Substitute xx into derivative: We now have the derivatives of both terms in the expression x45sin(w)x^4 - 5\sin(w). The derivative of the entire expression with respect to ww is the sum of the derivatives of the individual terms: (ddw)(x45sin(w))=32wx35cos(w)(\frac{d}{dw})(x^4 - 5\sin(w)) = 32wx^3 - 5\cos(w).
  8. Substitute xx into derivative: We now have the derivatives of both terms in the expression x45sin(w)x^4 - 5\sin(w). The derivative of the entire expression with respect to ww is the sum of the derivatives of the individual terms: (d/dw)(x45sin(w))=32wx35cos(w)(d/dw)(x^4 - 5\sin(w)) = 32wx^3 - 5\cos(w).Finally, we substitute x=4w2+4x = 4w^2 + 4 into the expression for the derivative to express it entirely in terms of ww: (d/dw)(x45sin(w))=32w(4w2+4)35cos(w)(d/dw)(x^4 - 5\sin(w)) = 32w(4w^2 + 4)^3 - 5\cos(w).

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