plz solve it

Asked by  | 2nd Feb, 2009, 05:24: PM

Expert Answer:

Remember that whenever you have to prove addition or subtraction of two terms equal to one term , take LCM.

 Also ,using the trigonometric identities which are appropriate for the question  , helps in getting to the answer quickly without wasting too much time.

Answered by  | 2nd Feb, 2009, 05:47: PM

Queries asked on Sunday & after 7pm from Monday to Saturday will be answered after 12pm the next working day.