AIR MATH

Math Question

Given right triangle \( A B C \), which of the following statements must be true? Check all that apply. A. \( \cos A=\sin \left(A-90^{\circ}\right) \) B. \( \angle 4 \) and \( \angle C \) are congruent C. \( \sin A=\cos C \) D. \( \cos A=\sin \left(90^{\circ}-4\right) \)

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