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sinA<sinB cosA<cosB tanA<tanB sinA<cosA
sinA=sinB tanA=tanB sinA=cosB cosA=cosB
sinA=sinB cosA=sinB tanA=tanB sinA=tanB
sinA=sinB cosA=cosB sinA=cosB sin(A+B)=sinC
sinA=sinB cosA=sinB sinA=cosB ∠A.+∠B.=90°
sinA=sinB cosA=sinB sinA=cosB sin(A+B)=sinC
sinA=sinB tanA=tanB sinA=cosB cosA=cosB
sinA=sinB cosA=sinB sinA=cosB ∠A+∠B=90°
tanA=cotB tanAcotB=1 (sinA)+(cosA)=1 ( )(sinA)+(sinB)=1