math
posted by suvaion .
Without a calculator, find the exact value of csc20° − cot 40° , showing work.

In google type :
csc20° − cot 40°
When you see list of result click on :
What is csc(20)  cot(40)? or csc(pi/9)  cot(2pi/9)
You will see solution step by step.