Q. Given that y=v2+5, find dvd(5v3−2siny) in terms of only v.Answer:
Identify Function and Relationship: Identify the function to differentiate and the given relationship between y and v. We need to differentiate 5v3−2sin(y) with respect to v, and we are given that y=v2+5.
Apply Chain Rule: Apply the chain rule to differentiate 5v3−2sin(y) with respect to v. The derivative of 5v3 with respect to v is 15v2. The derivative of −2sin(y) with respect to v is −2cos(y)⋅dvdy, where dvdy is the derivative of y with respect to v.
Differentiate y=v2+5: Differentiate y=v2+5 with respect to v to find dvdy. The derivative of v2 with respect to v is 2v. The derivative of a constant, 5, is 0. So, dvdy=2v.
Substitute dvdy: Substitute dvdy into the derivative of −2sin(y) with respect to v. We have −2cos(y)⋅dvdy=−2cos(y)⋅2v.
Combine Derivatives: Combine the derivatives to get the final answer.The derivative of 5v3 with respect to v is 15v2.The derivative of −2sin(y) with respect to v is −4v⋅cos(y).So, the derivative of 5v3−2sin(y) with respect to v is 15v2−4v⋅cos(y).
Replace y in Final Derivative: Replace y with v2+5 in the final derivative expression.Since y=v2+5, we substitute y with v2+5 in the cosine term to express the derivative entirely in terms of v.The final derivative is 15v2−4v⋅cos(v2+5).