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5 June, 16:05

In this figure, sin (a) = 2 3 What is the value of cos (b) ? A) 1 3 B) 2 3 C) 2 3 D) 3 2

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  1. 5 June, 18:33
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    23

    The angles a and b sum to 90°, so they are complementary. A trigonometric identity asserts that cos (90° - a) = sin (a) for any angle a, so cos (b) = sin (a) = 23.
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