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How would you differentiate ln(sin(3x))?

To answer this question we require the chain rule, which states that dy/dx=(dy/du)*(du/dx)

To use this formula in our question, we can let y=ln(sin(3x))=ln(u) where u=sin(3x)

Firstly, using a standard result we have dy/du=1/u

Secondly, we must work out du/dx. Another standard result is that d/dx(sin(ax))=a*cos(ax) for any constant number a. This means du/dx=3*cos(3x)

Putting the two parts together, we find that our answer, given by dy/dx, is equal to

3*cos(3x)*1/u=(3*cos(3x))/(ln(sin(3x)))

Hannah D. A Level Maths tutor, GCSE Maths tutor, A Level Further Math...

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