### Home > CALC > Chapter Ch3 > Lesson 3.4.4 > Problem 3-189

3-189.

Without your calculator, find the equation of the tangent line to *z* = 0. Homework Help ✎

Write the tangent line in point-slope form: *y* − *y*_{1} = *m*(*x* − *x*_{1})

Find the point by evaluating *g*(0). Careful! Notice the denominator.

Though the denominator 'cancels out', there remains a hole in the graph at *z* = 0. Since there is no point, there is no line, and consequently no tangent line.

Step 2 would be to use *g* '(*z*) to find the slope at *z* = 0. However, since the tangent line does not exist, there is no reason to find its slope!