Question
Function
Find the first partial derivative with respect to d
Find the first partial derivative with respect to n
∂d∂v=nπ
Evaluate
v=π×nd
Multiply the terms
v=nπd
Find the first partial derivative by treating the variable n as a constant and differentiating with respect to d
∂d∂v=∂d∂(nπd)
Use differentiation rule ∂x∂(g(x)f(x))=(g(x))2∂x∂(f(x))×g(x)−f(x)×∂x∂(g(x))
∂d∂v=n2∂d∂(πd)n−πd×∂d∂(n)
Evaluate
More Steps

Evaluate
∂d∂(πd)
Use differentiation rule ∂x∂(cf(x))=c×∂x∂(f(x))
π×∂d∂(d)
Use ∂x∂xn=nxn−1 to find derivative
π×1
Multiply the terms
π
∂d∂v=n2πn−πd×∂d∂(n)
Use ∂x∂(c)=0 to find derivative
∂d∂v=n2πn−πd×0
Any expression multiplied by 0 equals 0
∂d∂v=n2πn−0
Removing 0 doesn't change the value,so remove it from the expression
∂d∂v=n2πn
Solution
More Steps

Evaluate
n2πn
Use the product rule aman=an−m to simplify the expression
n2−1π
Reduce the fraction
nπ
∂d∂v=nπ
Show Solution

Solve the equation
Solve for d
Solve for n
Solve for v
d=πnv
Evaluate
v=π×nd
Multiply the terms
v=nπd
Swap the sides of the equation
nπd=v
Cross multiply
πd=nv
Divide both sides
ππd=πnv
Solution
d=πnv
Show Solution
