Trig Functions/Radians for Special Angles (0,30,45,60,90 degree)

tan (90 degrees)

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cosecant

hypotenuse/opposite

cos (90 degrees)

0

sin (90 degrees)

1

tan (45 degrees)

1

cos (60 degrees)

1/2

sin (30 degrees)

1/2

cosine

adjacent/hypotenuse

cotangent

adjacent/opposite

reference angle

angle that is always acute (+) measured to the x-axis

co-terminal angle

both angles "terminate" at the same spot

secant

hypotenuse/adjacent

tangent

opposite/adjacent sine/cosine

sine

opposite/hypotenuse

60 degrees in radians

pi/3

45 degrees in radians

pi/4

30 degrees in radians

pi/6

cos (45 degrees)

√2/2

sin (45 degrees)

√2/2

tan (60 degrees)

√3

cos (30 degrees)

√3/2

sin (60 degrees)

√3/2

tan (30 degrees)

√3/3