Easy
Angle AAA is the complement of angle BBB.
Which equation about the two angles must be true?
cosA=sinB\cos A=\sin BcosA=sinB
sinA=sinB\sin A=\sin BsinA=sinB
sinA=cosA\sin A=\cos AsinA=cosA
cosB=sinB\cos B=\sin BcosB=sinB
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