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