Question
If ∆ABC is right angled at C, then the value of cos
(A+B) isSolution
We are given a right-angled triangle △ABC where C=90⁰. Angle Sum Property In any triangle = A+B+C=180⁰ Since C=90 , we get: A+B=90⁰ Find cos(A+B) cos(90)⁰ = 0
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