The Chain Rule of Differentiation: Derivative of Tan(x) and its Relationship to Sec(x)

d tan(x)

The derivative of the tangent function, d tan(x), is obtained by applying the chain rule of differentiation

The derivative of the tangent function, d tan(x), is obtained by applying the chain rule of differentiation. The chain rule states that if y = f(g(x)), then the derivative of y with respect to x is given by the product of the derivative of f(g(x)) with respect to g(x) and the derivative of g(x) with respect to x.

In the case of d tan(x), we can rewrite it as d tan(u), where u = x. Using the chain rule, we have:

d tan(u) = d tan(u)/du * du/dx

The derivative of tan(u) with respect to u can be found using the derivative formula for the tangent function. The derivative of tan(u) is sec^2(u). Therefore, we have:

d tan(u)/du = sec^2(u)

The derivative of u with respect to x is simply 1. Therefore, we have:

du/dx = 1

Substituting these values back into our chain rule equation, we get:

d tan(x) = sec^2(u) * 1

Simplifying this expression, we have:

d tan(x) = sec^2(x)

Therefore, the derivative of the tangent function, d tan(x), is equal to the secant squared function, sec^2(x).

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