AIR MATH

Math Question

10 The figure shows triangle \( A B C \). Select all expressions that must be equivalent to \( \cos A \). A \( \sin x^{\circ} \) B \( \sin y^{\circ} \) C \( \cos y^{\circ} \) D \( \cos (90-y)^{\circ} \) E \( \cos (90-x)^{\circ} \) \( \sqrt{-1}+\operatorname{lnn} \ldots \)

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