cos75度等于几分之几

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cos75度等于几分之几
cos75度等于几分之几

cos75度等于几分之几
cos75
=cos(45+30)
=cos45cos30 - sin45sin30
=(√2/2) * (√3/2) - (√2/2)* (1/2)
==(√6-√2)/4
cos(A+B)=cosAcosB - sinAsinB

cos75度=sin15度=（√6-√2）/4

（√6-√2）/4

cos75度等于几分之几 sin105度等于几分之几 sin75度等于几分之几 sin75度等于几分之几 sin60度等于几分之几 cos15度等于几分之几 sin60度等于几分之几 cos30度等于几分之几 tan60度等于几分之几 sin45度等于几分之几 8.15度等于几分之几平角 tan60度等于几分之几 tan30度等于几分之几 sin135度等于几分之几 cos105度等于几分之几 tan15度等于几分之几 cos150度等于几分之几 sin120度等于几分之几