Question: please help me solving question 8 and 9 8. Determine the equation for the tangent line to y=6tan(x)tan(2x) at x=0.[A4] 9. Determine the second derivative

please help me solving question 8 and 9
8. Determine the equation for the tangent line to y=6tan(x)tan(2x) at x=0.[A4] 9. Determine the second derivative of f(X)=cot(4x). [A4]
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