Q. Given that y=v4+2, find dvd(3y2+4cosv) in terms of only v.Answer:
Given Function: We are given the function y in terms of v:y=v4+2We need to find the derivative of the expression 3y2+4cos(v) with respect to v. To do this, we will use the chain rule for differentiation, which states that the derivative of a composite function is the derivative of the outer function times the derivative of the inner function.
Derivative of y: First, let's find the derivative of y with respect to v: y=v4+2 dvdy=dvd(v4)+dvd(2) dvdy=4v3+0 dvdy=4v3
Derivative of 3y2: Now, let's differentiate the expression 3y2 with respect to y: dyd(3y2)=6y
Chain Rule Application: Using the chain rule, we can now find the derivative of 3y2 with respect to v: dvd(3y2)=dyd(3y2)⋅dvdydvd(3y2)=6y⋅4v3dvd(3y2)=24yv3
Derivative of 4cos(v): Next, we differentiate 4cos(v) with respect to v:dvd(4cos(v))=−4sin(v)
Combining Derivatives: Now we can combine the derivatives of both parts of the expression:dvd(3y2+4cos(v))=dvd(3y2)+dvd(4cos(v))dvd(3y2+4cos(v))=24yv3−4sin(v)
Substitution and Final Result: Finally, we substitute the expression for y in terms of v into the derivative: dvd(3y2+4cos(v))=24(v4+2)v3−4sin(v)dvd(3y2+4cos(v))=24v7+48v3−4sin(v)
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