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MATHEMATICS

1 tan tan. x y xy. ± , cot(x. ±. y)= cot cot 1 coty cotx. x y. ± sin. α±. sin. β =2sin. 1 2 (α±β)cos. 1 (α β) cos. α + cos. β 2 cos 1 2 (α + β) cos 2 (α-β) cos. α-cos. β=-2sin. 1 2 (α + β) sin 1 2 (αβ) Identities related to sin 2x, cos2x, tan 2x, sin3x, cos3x and tan3x. • Trigonometric Functions -Relationship between ...

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