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cos( + Z?)=sin QSinb- cos a cos b =tan75 =cos75 =sin(-Z?)=cos 67 sin Z?-cos Z? sin 6f =sin 2a =-COSaSina =cos2Z = =tan(-Z?)=ta6r-tanZ? =tan =sin2 a =cos2 a =l+costz =cos a-l =lsintz =I-Sina =在Sina - CoSa =COSQ-Sina =sinasin/?+coscosZ? =,z13、sn(-a)=cos(+L) =22