Question:
Find the derivative of the function
f(x)=e2x2sin2(x2−3x)Step-by-Step Solution:
To find the derivative of the given function using the chain rule, we will break it down into simpler functions and apply the chain rule to each part.
Step 1: Identify the outermost function and the inner composite function.
In this case, the outermost function is the fraction and the inner composite function is the ratio of two functions - the numerator and the denominator.
Step 2: Differentiate the numerator and denominator separately using the chain rule.
Let's begin by finding the derivative of the numerator, which is sin2(x2−3x).
Using the chain rule, we can differentiate the square of sine function with respect to its inner function.
dxd(sin2(u))=2sin(u)cos(u)⋅dxdu
Here, u=x2−3x.
So, dxd(sin2(x2−3x))=2sin(x2−3x)cos(x2−3x)⋅dxd(x2−3x)
Expanding the derivative of the denominator using the chain rule, we get:
dxd(x2−3x)=dxd(x2)−dxd(3x)=2x−3
Substituting the above values, the derivative of the numerator becomes:
dxd(sin2(x2−3x))=2sin(x2−3x)cos(x2−3x)⋅(2x−3)
Step 3: Differentiate the denominator.
The denominator is e2x2.
To differentiate eu, we multiply it by the derivative of its exponent.
dxd(eu)=eu⋅dxdu
In this case, u=2x2.
So, dxd(e2x2)=e2x2⋅dxd(2x2)
Again, using the chain rule, the derivative of the exponent becomes:
dxd(2x2)=2⋅dxd(x2)=4x
Substituting the above values, the derivative of the denominator becomes:
dxd(e2x2)=e2x2⋅4x=4x⋅e2x2
Step 4: Apply the chain rule to find the derivative of the entire function.
Using the quotient rule, the derivative of the function f(x)=e2x2sin2(x2−3x) can be written as:
f′(x)=h(x)2g′(x)⋅h(x)−g(x)⋅h′(x)Where g(x)=sin2(x2−3x) and h(x)=e2x2.
Substituting the expressions for g′(x), g(x), h′(x), and h(x), we get:
f′(x)=(e2x2)2(2sin(x2−3x)cos(x2−3x)⋅(2x−3)⋅e2x2)−(sin2(x2−3x)⋅4x⋅e2x2)Simplifying the equation further, we have:
f′(x)=e4x2(4sin(x2−3x)cos(x2−3x)⋅(2x−3)⋅e2x2)−(4xsin2(x2−3x)⋅e2x2)Finally, we can simplify the expression further, if desired, by factoring out the common terms (2x−3)⋅e2x2 in both the numerator:
f′(x)=e4x24sin(x2−3x)cos(x2−3x)⋅(2x−3)⋅e2x2[1−xsin(x2−3x)]Therefore, the derivative of the given function is:
f′(x)=e4x24sin(x2−3x)cos(x2−3x)⋅(2x−3)⋅e2x2[1−xsin(x2−3x)]