Trig
posted by Don .
Rewrite tan 88 deg in terms of its cofunction
How does that end up????

Notice there are only 3 trig names
all have matching cofunction
sine  cosine
secan cosecant
tangent  cotangent , so that
sinØ = cos(90° Ø)
secØ = csc(90°  Ø)
tanØ = cot(90°  Ø)
so tan 88° = cot 2°