Don't understand problem #2 & #3. Need help solving question with steps. Please help. It's limit definition of derivative - differentiation rules

[2] [6 points] Let f[x}=x33x'9x+zo_ [a] Use the differentiation rules to nd I'EK] . to] Find all points on the graph offat which the tangent line is horimntal. Be sure to include both the xand y coordinates of each point. [3] Use the differentiation rules to nd the derivative of each function. Wri'ne your makers in simplest fowl and without negative expona'ns. _f2 [3| furlm f d. [h] ll-F x