It is known that Tana = 3 / 4,0

It is known that Tana = 3 / 4,0

Sina / cosa = Tana = 3 / 4sina = 3 / 4 * cosasin & # 178; a = 9 / 16 * cos & # 178; a = 1, so cos & # 178; a = 16 / 25sin2a = 2sinacosa = 2 (3 / 4 * COSA) cosa = 3 / 2 * cos & # 178; a = 24 / 25