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Given that 
v=4u^(3)+3, find 
(d)/(du)(3u^(2)-2sin v) in terms of only 
u.
Answer:

Given that v=4u3+3 v=4 u^{3}+3 , find ddu(3u22sinv) \frac{d}{d u}\left(3 u^{2}-2 \sin v\right) in terms of only u u .\newlineAnswer:

Full solution

Q. Given that v=4u3+3 v=4 u^{3}+3 , find ddu(3u22sinv) \frac{d}{d u}\left(3 u^{2}-2 \sin v\right) in terms of only u u .\newlineAnswer:
  1. Apply Chain Rule: First, we need to apply the chain rule to differentiate the expression with respect to uu. 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, we have an outer function which is 3u22sin(v)3u^2 - 2\sin(v) and an inner function v(u)=4u3+3v(u) = 4u^3 + 3.
  2. Differentiate Outer Function: We start by differentiating the outer function with respect to vv, which is the variable inside the sine function. The derivative of 3u23u^2 with respect to vv is 00, since it does not contain vv. The derivative of 2sin(v)-2\sin(v) with respect to vv is 2cos(v)-2\cos(v).
  3. Differentiate Inner Function: Now we differentiate the inner function v=4u3+3v = 4u^3 + 3 with respect to uu. The derivative of 4u34u^3 with respect to uu is 12u212u^2, and the derivative of the constant 33 is 00. So, dvdu=12u2\frac{dv}{du} = 12u^2.
  4. Multiply Derivatives: Using the chain rule, we multiply the derivative of the outer function by the derivative of the inner function. This gives us the derivative of the entire expression with respect to uu: (02cos(v))×(12u2)(0 - 2\cos(v)) \times (12u^2).
  5. Simplify Expression: Simplify the expression by distributing the 12u212u^2 across the terms inside the parentheses: 2cos(v)×12u2=24u2cos(v)-2\cos(v) \times 12u^2 = -24u^2\cos(v).
  6. Substitute back into Expression: Finally, we need to express the derivative in terms of uu only. Since v=4u3+3v = 4u^3 + 3, we substitute vv back into our expression for the derivative. This gives us 24u2cos(4u3+3)-24u^2\cos(4u^3 + 3).

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