please solve 18-21

cos'(x) - 3 4 lin 18 V3 B) Limit does not exist C) D) -7 19.1 f(x) = In (x ) which is the tangent line to f at x = e? 4-41 = m ( x-x ' ) A) y- 3e =-(x-e) B) y - 30 = 30 ( x -e ) C y - 3 = =(x-e) D) y- 3=30'(x-e) 20. Given f(x) = 17x2 +8 find the equation of the tangent line through x = 2. A) Y- 6=~(x-2) B) y-6= 17 (x-2) 28 q y-6=6(x-2) D) y- 6 =- (x-2) 21. Given the function s(t) = cos' (4t) , what is the first value of f , in the interval 0