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For all the y, the cos y is equal to which of the following?
sin y
sin (-y)
cos (-y)
sin y+ cos y
cos (y+pie)
how did they got the answer?cos (-y)
help me please
sin y
sin (-y)
cos (-y)
sin y+ cos y
cos (y+pie)
how did they got the answer?cos (-y)
help me please