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If A + B + C = 90°, the what is the value of cos (A + C) ? (A) – cos B (B) cos B (C) – sin B (D) sin B |
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Answer» The correct option is (D) sin B Explanation: Given A + B + C = 90° cos (A + C) ⇒cos (90 – B) {∵ cos (90 – θ) = sinθ} ⇒ sinB |
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