#csc# (cosecant) is the reciprocal of sine, so it is hypotenuse over opposite side to the angle
#cos# is adjacent side to the angle over hypotenuse
#cot# is the reciprocal of tangent, so it is adjacent side to angle over opposite side to angle
Let's use #H# to represent hypotenuse, #O# to represent opposite, and #A# to represent adjacent
#H/O*A/H=cancel(H)/O*A/cancel(H)=A/O rarr# #A/O# represents cotangent