Trigonometric Sum
I edited the image as there was a typo in the question
But I don't know what to do in this question
5 Replies
@Apu
@Apu
Note for OP
+solved @user1 @user2... to close the thread when your doubt is solved. Mention the users who helped you solve the doubt. This will be added to their stats.Note for OP
+solved @user1 @user2... to close the thread when your doubt is solved. Mention the users who helped you solve the doubt. This will be added to their stats.looks like a series where you can pair first and last term
hint is in the answer itself, have you tried it to be 2n sin 2n.... + 2x90 sin 2x90
then you can either pair first and last term (which doesnt work here) or something of that sort?
As said above, pair the first and the last term and so on, then take 180 common and use the sine A.P. series formula.