
Mark M. answered 04/20/20
Mathematics Teacher - NCLB Highly Qualified
If tan θ is undefined then cos θ = 0.
If cos θ i= 0 then sin θ = 1 or sin θ = -1
If cos θ = 0 then sec θ is undefined
if tan θ is undefined then cot θ = 0
If sin θ = 1 then csc θ = 1
If sin θ = -1 then csc θ = -1