Trig Angle Measures
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cotangent
A/O, reciprocal of tangent COT
secant
H/A, reciprocal of cosine SEC
cosecant
H/O, reciprocal of sine, CSC
30 degrees
sin - 1/2 cos - (sqrt3)/2 tan- (sqrt3)/3 or 1/Sqrt3
all others can be derived from these
SOHCAHTOA
45 degrees
sin- (sqrt2)/2 or 1/sqrt2 cos- (sqrt2)/2 or 1/sqrt2 tan - 1
60 degrees
sin-(sqrt3)/2 cos- 1/2 tan - sqrt3