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Chain Rule:

let u=2x and y=tan(u)

du/dx = 2 and dy/du = sec^2(u)

dy/dx = du/dx x dy/du

multiply them together and replace u=2x into the equation..

therefore dy/dx = 2(sec^2(2x))

hope that helps.

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Q: How do you differentiate Tan2x?
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