3 The curve C has equation y = 3x2 - 12x + 8 (a) Find dy/dx

(2)
(b) Find the coordinates of the point on where the gradient of the curve is 18

Write the sine and cosine values of a, b, respectively, in the figure for (1) and (2) + explanation.

X/y + 4y/x divided by x/y - 2y/x explain as in depth as you can how you simplfied the fractions. i don't know where to start on this : /

1. 2. ∠b and ∠y are right angles. 3.? 4.? which two statements are missing in steps 3 and 4? ∠x ≅ ∠c △abc ~ △zyx by the sas similarity theorem. ∠b ≅ ∠y △abc ~ △zyx by the sas similarity theorem. = 2 △abc ~ △zyx by the sss similarity theorem. = 2 △abc ~ △zyx by the sss similarity theorem.