which book should we prefere for trignonmetry for 11th and 12th other than R D sharma?

you should prefer complete course iit mathematics of tata mc graw hill publishers. not only for trignometry it is overall a best book for iit jee advanced  preparations
regards sahil

@ drumil 
Kindly mention for what purpose – board and school level or entrance level . 
If entrance then , frst of all ncert is most important for jee mains , 
after that u can go with mathematics by m l khanna , its a very good book for JEE . 
and after that for shortcut tips and trick u can go for 
jee advanced maths by (trigo ) by s l loney 
and objective mathematics by r d sharma are also very nice . 
and also take a look on cengage publication books , 
if u prefer that , then take it , in the place of m l khanna . 

ALL THE BEST ..