ok......practice for CBSE math.....easy stuff

THIS IS SERIOUSLY NOT FOR IITJEE practice.....THEY ARE 2222222 EASY............ ONLY FOR CBSE sure shot QUESTIONS...

Please other guys dont scold me for these easy questions..
1. Find the principal value of tan^-1(tan7∩/6)+cot^-1cot7∩/6.....

2.Evaluate..._o∫^∩/2(x+sinx)dx/(1+cosx)...

3.Two tailors A and B earn Rs.150 and Rs. 200 per day respectively. A can stich 6 shirts and 4 pants per day whike B can stich 10 shirts and 4 pants per day. How many days shall each work if it desired to produce atleast 60 shirts and 32 pants at a minimum labour cost?? GRAPHICALLY..........

Solve these yaar u cud be sure of 11 marks in d next board paper..