Question

If a triangle ABC is right angled at C,then value of cos ( A+B)is​

Answer 1

Answer:

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Answer 2

Since ABC is right angled and angle C is 90°

therefore,

A+B+C=180°

A+B=180° - C

A+B=180°-90°

A+B= 90°

Therefore, cos ( A+B ) = cos 90°

                 cos ( A+B ) = 0