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19 September, 15:10

In right triangle ABC, A and B are complementary angles and sin A = 8/9. What is cos B? NextReset

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  1. 19 September, 15:19
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    A and B are complementary, that means m∠A+m∠B=90

    Recall that sinA=cos (90-A), if sinA=8/9, cos (90-A) is also 8/9

    therefore, cosB=cos (90-A) = sinA=8/9
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