Q. Find the derivative of the following function.y=ln(−2x3)Answer: y′=
Apply Chain Rule: First, we need to apply the chain rule to differentiate the function y=ln(−2x3). 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.
Find Derivative of Inner Function: The outer function is the natural logarithm ln(u), and its derivative is u1. The inner function is −2x3, and we will find its derivative next.
Apply Chain Rule Again: The derivative of the inner function −2x3 with respect to x is found by using the power rule, which states that the derivative of xn is n⋅x(n−1). So the derivative of −2x3 is −2⋅3⋅x(3−1)=−6x2.
Simplify Expression: Now we can apply the chain rule. The derivative of y with respect to x is the derivative of the outer function evaluated at the inner function times the derivative of the inner function. This gives us y′=−2x31×(−6x2).
Cancel Common Terms: Simplify the expression by multiplying the two terms. This gives us y′=−2x3−6x2.
Simplify Constant Terms: We can simplify the expression further by canceling out the common terms. The x2 in the numerator and one of the x's in the denominator cancel out, and the negatives cancel each other. This leaves us with y′=2x6.
Simplify Constant Terms: We can simplify the expression further by canceling out the common terms. The x2 in the numerator and one of the x's in the denominator cancel out, and the negatives cancel each other. This leaves us with y′=2x6.Finally, we can simplify the constant terms. 6 divided by 2 is 3, so the final simplified derivative is y′=x3.
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