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can someone explain y we times 2 in first line kinda ded so dk y sols did that (1 Viewer)

cossine

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Most likely coming from chain rule. Whenever the thing you are taking derivative of is not in the proper chain rule is required.

In this case let u = tan^-1(x/3)

To keep things simple try finding first d/dx (tan^-1(x/3)) use a online differentiation calculator if need be.
 

VictorTango-9W

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Most likely coming from chain rule. Whenever the thing you are taking derivative of is not in the proper chain rule is required.

In this case let u = tan^-1(x/3)

To keep things simple try finding first d/dx (tan^-1(x/3)) use a online differentiation calculator if need be.
Aight thanks bro
 

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