just tel me how to setup
I will assume your equation is as you typed it, and not
y = 4/(x+6)
y = 4/x + 6
= 4x^-1 + 6
dy/dx = -4x^-2
at (8,2) , dy/dx = -4/64 = -1/16
y-2 = (-1/16)(x - 8)
16y - 32 = -x + 8
x + 16y = 40
y = [tan(5x^8)]^3
dy/dx = 3[tan(5x^8)]^2 (sec(5x^8) (40x^7)
use your calculator to find the messy answer for dy/dx
why 64 not 8
notice dy/dx = -4/(x^2)
= -4/(8^2) = -4/64 or -1/16
just plug pi/4
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