(Solved): solve for a and b  a. Use the definition \( m_{\tan }=\lim _{h \rightarrow 0} \frac{f(a+h)-f(a) ...

a. Use the definition \( m_{\tan }=\lim _{h \rightarrow 0} \frac{f(a+h)-f(a)}{h} \) to find the slope of the line tangent to the graph of \( f \) at \( P \). b. Determine an equation of the tangent line at \( P \). \[ f(x)=x^{3}, P(-2,-8) \] a. \( \mathrm{m}_{\tan }= \)