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Definitions of the Six Trigonometric Functions Right triangle definitions, where 0 2 . hyp opp hyp sec adj adj cot opp csc Opposite opp hyp adj cos hyp opp tan adj sin Sum and Difference Formulas θ Adjacent y r x cos r y tan x sin r y r sec x x cot y 1 csc 1 tan cot 1 csc sin (x, y) 1 sec 1 cot tan 1 sec cos cos Tangent and Cotangent Identities tan sin cos cot cos sin Pythagorean Identities sin 2 cos2 1 1 tan 2 sec2 1 cot 2 csc2 Cofunction Identities sin cos 2 tan cot 2 sec csc 2 Negative Angle Identities sin sin tan tan sec sec sin 2 2 sin cos cos 2 cos2 sin 2 2 cos2 1 1 2 sin 2 2 tan tan 2 1 tan 2 csc Reciprocal Identities sin Double-Angle Formulas y Circular functions, where θ is any angle. y r x sin sin cos cos sin cos cos cos sin sin tan tan tan 1 tan tan θ x Power-Reducing Formulas 1 cos 2 2 1 cos 2 cos2 2 1 cos 2 tan 2 1 cos 2 sin 2 Half-Angle Formulas 1 cos 2 2 1 cos cos 2 2 1 cos 1 cos sin tan 2 1 cos sin 1 cos sin Sum-to-Product Formulas cos sin 2 cot tan 2 csc sec 2 cos cos cot cot csc csc sin sin 2 sin cos 2 2 sin sin 2 cos sin 2 2 cos cos 2 cos cos 2 2 cos cos 2 sin sin 2 2 Product-to-Sum Formulas 1 cos cos 2 1 cos cos cos cos 2 1 sin cos sin sin 2 sin sin Unit Circle and Special Angles x cos , y sin x2 y2 1 y 0,1 1 3 , 2 2 1 3 , 2 2 2 2 2 , 2 2 , 2 2 2 3 1 2 , 2 3 1 , 2 2 1,0 1,0 x 3 1 , 2 2 3 1 2 , 2 2 2 , 2 2 2 2 , 2 2 1 , 3 2 2 1 , 3 2 2 0,1 (radians) (degrees) sin cos tan cot sec csc 0 0 0 1 0 Undefined 1 Undefined 1 2 2 2 3 2 3 2 2 2 1 2 3 3 3 2 3 3 2 1 1 2 3 3 3 2 6 4 3 30 45 60 2 2 3 3