what is this differentiated 2 cosh^2 3x thanks
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Originally Posted by thrusterkel what is this differentiated 2 cosh^2 3x thanks note that $\displaystyle \frac d{dx} \cosh u = u' \sinh u$ where $\displaystyle u$ is a function of $\displaystyle x$ use that fact along with the Chain rule and you'll have the answer try it and tell me what you get
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