By definition, Cot(α)=Adjacent leg/Opposite leg
Then, when you substitute the values, you obtain:
Cot(3π/4)=-(√2/2)/(√2/2)
When you simplify the expression, you have the following result:
Cot(3π/4)=-1
What is the exact value of Cot(3π/4)?
The answer is: The exact value of Cot(3π/4) is -1