2 Answers

Knase · Answer 1 · 2019-07-25T17:42:47+0000

AC is the adjacent leg to C and BC is the hypotenuse. So we're talking about the cosine:

$\cos C = (AC)/(BC)$

For part 2, the co in cosine means "complementary" so cos x equals the sine of the complementary angle, that's going to be

$\sin y$

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