Pre Calculus

Determine an equation pf the tangent line to the function at given point. Function  y=ln(x)/x  Point (e,1/e)

Q Evaluate the limit using the substitution method.    lim x-->0 tan^-1(e^3x)

Find the slope of the graph at the indicated point. Then write an equation of the tangent line to the graph of the function at the given point. f(x)=1+2xln(x), (1,1)

Evaluate  the limit  lim x-> +infinity sqrt (3x^2+8x+6 )-sqrt(3x^2+3x+1)