Match List-I with List-II and choose the correct option. List-I: (I) {x∈[−2π/3,2π/3]:cosx+sinx=1}; (II) {x∈[−5π/18,5π/18]:√3 tan3x=1}; (III) {x∈[−6π/5,6π/5]:2cos(2x)=√3}; (IV) {x∈[−7π/4,7π/4]:sinx−cosx=1}. List-II: (P) has two elements; (Q) has three elements; (R) has four elements; (S) has five elements; (T) has six elements.