need help with these calc questions Lesson 2.9 Linear
Approximations and Differentials 1.Find the linearization L(x) of
the function at a. f(x)=2/√(x^2-5) a=3 2.Compute ∆y and dy for the
given values of x and dx=∆x. f(x)=x-x^3, x=0, ∆x=-0.3 3.Use a
linear approximation to estimate cos⁡〖29°〗. Show all work. 4.The
circumference of a sphere was measured to be 84 cm with a possible
error of 0.5 cm. Use differentials to estimate the maximum error in
the calculated surface area.