Solve this question fast plzzz

Solve this question fast plzzz 18. Find the equations of the normal to the curve y = 4x3 the line 19. Find: f x(x2 +1)2 x+lxl+l 20, Evaluate: dx —3x+5 which are perpendic 21. Find the particular solution Of the following differential equation. cosy dx + (l + 2e-x )sin y dy O; y(0) — 4 Find the general solution of the differential equation: dx ytany—xtany—xy y tan y 22. If a vect« of magnitude units perpendic