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Special Triangles and Memorable Trigonometric Values ________________________ ________________________ opposite adjacent opposite sin cos tan hypotenuse hypotenuse adjacent       1 3 1 sin sin 30 cos cos 30 tan tan 30 6 2 6 2 6 3 3 1 sin sin 60 cos cos 60 tan 3 tan 60 3 2 3 2 3 o o o o o o                   1 1 sin sin 45 cos cos 45 tan 1 tan 45 4 4 4 2 2 o o o          sin 1 sin 90 cos 0 cos 90 tan tan 90 2 2 2 sin 0 sin180 cos 1 cos180 tan 0 tan180 sin 0 0 sin180 cos o o o o o o o Undefined                        1 cos 0 tan0 0 tan 0 o o    o ( in radians) ( in degrees) 180    