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So simple...
As sum of three angles of sin is 3 so each is equal to 1 ...
so ... angle will be equal to 90...
So cos 90 = 0 ..
Hence sum = 0 ....
As sum of three angles of sin is 3 so each is equal to 1 ...
so ... angle will be equal to 90...
So cos 90 = 0 ..
Hence sum = 0 ....
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