Find the value of cos (A +B) where A, B are acute angles if tan A =1 and sin B =1/√2
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Answer:
tan A = 1
therefore tan A = tan 45 (tan 45 = 1)
therefore A = 45
sin B = 1/root2
sin B = sin 45 (sin 45 = 1/root2)
therefore B = 45
cos(A + B) = cos(45 + 45) = cos(90)
cos(90) = 0
Step-by-step explanation:
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