TRIGONOMETRY CHEAT SHEET Basic Formulas tan(2a) Pythagorean Theorem Half Angle Formulas c2 a 2 b2 c Opposite sin(a) Hypotenuse cos(a) a b Adjacent Hypotenuse tan(a) sin(a) cos(a) csc(a) 1 sin(a) a cos 2 1 cos(a) 2 2 sin(a b) sin(a)cos(b) cos(a) sin(b) sin(a b) sin(a)cos(b) cos(a) sin(b) cos(a b) cos(a)cos(b) sin(a) sin(b) 1 tan(a) cos(a b) cos(a)cos(b) sin(a) sin(b) tan(a) tan(b) 1 tan(a) tan(b) tan(a) tan(b) tan(a b) 1 tan(a) tan(b) tan(a b) cos(a) cos(a) tan(a ) tan( a) Pythagoras identities ab a b sin( a ) sin(b) 2sin cos 2 2 sin (a) cos (a) 1 2 1 tan 2 (a) sec 2 (a) a b a b sin( a ) sin(b) 2 cos sin 2 2 1 cot 2 (a) csc 2 ( a) Double angle formulas sin(2a) 2sin(a) cos(a) cos(2a) cos (a) sin (a) 2 1 cos(a) More Trigonometry Formulas sin(a ) sin(a) 2 a sin 2 sin( a ) 1 cos( a) a tan sin( a) 2 1 cos( a) 1 sec(a) cos(a) cot(a) 2 tan(a) 1 tan 2 (a) 2 ab a b cos(a ) cos(b) 2 cos cos 2 2 a b a b cos(a ) cos(b) 2sin sin 2 2 Math Tutor www.carsoncitytutor.com UNIT CIRCLE Math Tutor www.carsoncitytutor.com