Identify Function Type: Identify the type of function and the rule needed to differentiate it.We have a composite function where an inner function 9x2−2 is raised to the power of another function sec(x). To differentiate this, we will need to use the chain rule and the product rule, as the exponent itself is a function of x.
Apply Chain Rule: Apply the chain rule to differentiate the outer function with respect to the inner function.Let u=9x2−2 and v=sec(x). Then y=uv. The derivative of y with respect to u is v⋅u(v−1) by the power rule. We will later multiply this by the derivative of u with respect to x.
Differentiate Inner Function: Differentiate the inner function u=9x2−2 with respect to x. The derivative of u with respect to x is dxdu=18x.
Apply Product Rule: Apply the product rule to differentiate the outer function with respect to x. Since y=uv, we need to differentiate v⋅u(v−1) with respect to x. This requires the product rule because v is a function of x. The product rule states that dxd(uv)=udxdv+vdxdu.
Differentiate sec(x): Differentiate v=sec(x) with respect to x. The derivative of sec(x) with respect to x is sec(x)tan(x). So dxdv=sec(x)tan(x).
Apply Product Rule with Derivatives: Apply the product rule using the derivatives from steps 3 and 5.We have u=9x2−2, dxdu=18x, v=sec(x), and dxdv=sec(x)tan(x). Plugging these into the product rule, we get:dxdy=u(v−1)∗(v∗dxdu+u∗dxdv)=(9x2−2)(sec(x)−1)∗(sec(x)∗18x+(9x2−2)∗sec(x)tan(x))
Simplify Expression: Simplify the expression for dxdy.dxdy=(9x2−2)(sec(x)−1)⋅(18x⋅sec(x)+(9x2−2)⋅sec(x)tan(x))This is the simplified form of the derivative.
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