(7) (i)
First keep the value of x as 0 in f(x), you will get 3. Then keep a higher value, for example f(0.5 pie), you will get 1. So as you move from 0 to pie, the value of f(x) is decreasing so the range is :
\le3 )
(ii)
f(2/3 pie)
= 3 - 2tan(0.5 X 2/3 pie)
= 3 - 2tan(1/3 pie)
= 3 - 2 (

)
=

(

- 2)
(iii)
You simply need to draw the graph. Make sure you plot the graph only for the range given in the question.
(iv)
f(x) = 3 - 2 tan(

x), then let f(x) be y
y = 3 - 2tan(
)
x)
2tan(

x) = 3 - y
tan(

x) =
)

x = tan
-1)
x = 2 X tan
-1)
y = 2 X tan-1)