鏂囨暟锛?6绗?簩闂甤os2A=3/5锛屽垯锛?cos虏A锛?=3/5锛屽缑锛歝os虏A=4/5锛屽垯cosA=2鈭?/5銆怉鏄?攼瑙掋€戯紝鍒檚inA=鈭?/5锛宻inB=鈭?0/10锛屽垯cosB=3鈭?0/10锛屽垯锛歝os(A锛婤)=cosAcosB锛岘inAsinB=鈭?/2锛屽垯A锛婤=45掳锛孋=135掳銆俛/sinA=b/sinB=c/sinC锛屽垯锛歔a锛峛]/[sinA锛岘inB]=c/sinC锛屽缑锛歝=鈭?锛屽垯锛歛/sinA=c/sinC=鈭?0锛屽缑锛歛=鈭?锛宐/sinB=c/sinC=鈭?0锛屽缑锛歜=1