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

## Answers

Answered by

1

**Answer:**

0

**Step-by-step explanation:**

Fiven, C= 90°

A+B+C = 180°(Angle sum property)

=> A+B = 180° -C = 180° - 90° = 90°

Therefore,

cos(A+B)

= cos90° = 0

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