so i get the first few parts but i don’t know how to answer the last part, could anyone help please?
i) Sketch, on a single diagram showing values of x from-180° to +180°, the graphs of
y = tan x and y = 4 cos x.
The equation : tan x = 4 cos x
has two roots in the interval -180° ≤x≤ 180°. These are denoted by a and ß, where a <ß.
ii) Show a and ß on your sketch, and express ß in terms of a
iii) Show that the equation tan x = 4 cos x may be written as 4 sin^2x+ sin x−4=0.
Hence find the value of ß-a, correct to the nearest degree.
