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12分之派的正切值

tan(π/12)=sin(π/12)/cos(π/12)=2sin(π/12)/[2sin(π/12)*cos(π/12)]=[1-cos(π/6)]/sin(π/6)=(1-√3/2)/(1/2)=2-√3

sin(5π/3)=sin(2π/3+π)=-sin(2π/3)=-根号3除以2cos(5π/3)=cos(2π/3+π)=-cos(2π/3)=-1/2tan(5π/3)=tan(2π/3+π)=tan(2π/3)=-根号3

正弦值是-1/2 余弦值是二分之根号三 正切值是负的三分之根号三

tan12分之π-(tan12分之π)分之1= sin(π/12)/cos(π/12)-cos(π/12)/sin(π/12)=[sin^2(π/12)-cos^2(π/12)]/[cos(π/12)sin(π/12)]=-cos(2π/12)/[1/2sin(2π/12)]=(-√3/2)/(1/4)=-2√3

tan(12°12')=tan12.2°=0.216208

tan(π/12)=tan(π/3-π/4)=(tanπ/3-tanπ/4)/(1+tanπ/3tanπ/4)=(√3-1)/(1+√3)=(4-2√3)/2=2-√3tan12分之π-(tan12分之π)分之1=2-√3-1/(2-√3)=2-√3-2-√3=-2√3

sin(-π/12)=-sinπ/12=-(√6-√2)/4.

π=180度π/12=180/12=15°cos30 °= √3/2 cos15 °= √[(1 + cos30° )/2] sin15° = √[(1 - cos30° )/2] tan15° = sin15° /cos15° = √[(1 - cos30° )/(1 + cos30° )] = √[(2 - √3)/(2 + √3)] = (2 - √3)

角的弧度数 正弦 余弦 正切 π/6 1/2 根号3/2 根号3/3 π/4 根号2/2 根号2/2 1 π/3 根号3/2 1/2 根号3 π/2 1 0 不存在2π/3 根号3/2 -1/2 -根号33π/4 根号2/2 -根号2/2 -15π/6 1/2 -根号3/2 -根号3/3 π 0 -1 07π/6 -1/2 -根号3/2 根号3/35π/4 -根号2/2 -根号2/2 14π/3 -根号3/2 -1/2 根号33π/2 -1 0 不存在5π/3 -根号3/2 1/2 -根号37π/4 -根号2/2 根号2/2 -111π/6 -1/2 根号3/2 -根号3/32π 0 1 0

tan(-7π/12)=-tan(7π/12)=-tan(π/4+π/3)=-(1+√3)/(1-√3) =2+√3

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