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@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.The trig summation part is a formula and 1/2 got added n times so n/2
How did we get -1/2?
It is multiplied to all the cos so it was taken common from all the cos's
Hmm
Didn't we just take -1/2 common?
Where are we getting the n/2 from?
-1/2 common from the cos terms not the adding 1/2s
+solved @myst1cboomer
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