If ∆ABC is right angled at C, then the value of cos(A + B) is
(a) 0 (b) 1 (c) 12 (d) None of these
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If ∆ABC is right angled at C, then the value of cos(A + B) is
(a) 0 (b) 1 (c) 12 (d) None of these
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