If ABC is right angled at C, find the value of cos(A+B).


Answer:

0

Step by Step Explanation:
  1. We know that sum of the angles of a triangle is 180
    A+B+C=180
  2. It is given that angle C is right angle. Replace C=90 in above equation
    A+B+90=180
    A+B=18090
    A+B=90
  3. Now we know the value of A+B, we can find the value of cos(A+B)
    cos(A+B)=cos(90)
    cos(A+B)=0

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