my dear friend in this type problems always convert sinx and cox in terms of tan(x/2) and try to solve it.
all the best for your exams.
reply is must.
this is quite simple question put..
cos x = (1 - tan 2 x / 2) / (1 + tan 2 x / 2)
sin x = 2 tan (x/2) / (1 + tan 2 x / 2)
1 + tan 2 x / 2 = sec2 x/2
put tan x/2 = t
now solve .try it .........if u are not able to get the solution, than nudge i will provide u complete solution but plz try it once
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