tan15度等于几分之几

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tan15度等于几分之几
tan15度等于几分之几

tan15度等于几分之几
tan15°
=tan(60°-45°)
=(tan60°- tan45°)/(1+ tan60°*tan45°)
=(根号3 -1)/(1+根号3）
=(根号3-1)*(根号3-1)/[(根号3+1)(根号3-1)]
=(4-2根号3)/2
=2-根号3

tan15度等于几分之几 tan15度等于多少 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 cos150度等于几分之几 sin120度等于几分之几