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بس ممكن 
7
7
7
find an equation of the tangent line to the graph of y = g(x) at x = 5 if g(5) = −4 and g'(5) = 3
y=oo
if the tangent line to y = f (x) at (4, 9) passes through the point (0, 8), find f(4) and f '(4).oo
f (4) =oo
f '(4) =oo