Exercise 4.1

. (i) , 2π/ (ii) , 6π (iii) , π . (i) π/ (ii) −π/

. (i) 5π/ (ii) −π/ (iii) 24π/ . (i) [− , ] (ii) [− , ]

. < x < / . (i) (ii) 17π/

. (i) 7π/ (ii) (iii) − . . (i) ∞ (ii) √ / (iii) /

. (i) π/ (ii) π/ (iii) −π/ .(i) −π/ (ii) cot⁻¹( )=−π/ (iii) 5π/

. (i) −π/ (ii) −π/ (iii) −2π

. (i ) x = (ii ) x = a − b / + ab ( iii ) x = n π + π / , n ∈ ℤ

XII - Mathematics