Where Does the 3x Come From in e^(sec 3x)?

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SUMMARY

The expression 3x in the derivative of y = e^(sec 3x) arises from the application of the chain rule in calculus. When differentiating sec(3x), the derivative is sec(3x) tan(3x) multiplied by the derivative of the inner function, which is 3x. Therefore, dy/dx = e^(sec 3x) * sec(3x) tan(3x) * 3, confirming that the factor of 3 is derived from differentiating the argument of the secant function.

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can someone explain where the 3x comes from in the below example

y = e^(sec 3x)

dy/dx = e^(sec 3x) * d/dx(sec 3x)
= e^(sec 3x) * sec 3x tan 3x d/dx(3x)
^
where does this come from??
 
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Apply the chain rule to sec(3x).
 

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