Question 19

Find the range of the following functions given by

• (i)f (x) = 2
• (ii)f (x) = 1 – x − 2 2– x
• (iii)f (x) = x − 3
• (iv)f (x) = 1 + 3 cos2x (Hint : – 1 ≤ cos 2x ≤ 1 ⇒ – 3 ≤ 3 cos 2x ≤ 3 ⇒ –2 ≤ 1 + 3cos 2x ≤ 4)