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三角函数公式有很多，诱导公式，特殊角公式等。下面小编整理了三角函数计算方法及数值表，供大家参考!  1三角函数计算方法有哪些 角函数的关系 (正弦) Sin θ = 对边A / 斜边C (余弦) Cosθ = 邻边B / 斜边C (正切) Tanθ = 对边A / 邻边B 对边A = 斜边C * Sinθ 对边A = 邻边B * Tanθ 邻边B = 斜边C * Cosθ 邻边B = 对边A / Tanθ 斜边C = 对边A / Sinθ 斜边C = 邻边B / Cosθ 和差化积 2sinAcosB=sin(A+B)+sin(A-B) 2cosAsinB=sin(A+B)-sin(A-B) 2cosAcosB=cos(A+B)-sin(A-B) -2sinAsinB=cos(A+B)-cos(A-B) sinA+sinB=2sin((A+B)/2)cos((A-B)/2 cosA+cosB=2cos((A+B)/2)sin((A-B)/2) tanA+tanB=sin(A+B)/cosAcosB tanA-tanB=sin(A-B)/cosAcosB 倍角公式 Sin2A=2SinA.CosA Cos2A=CosA^2-SinA^2=1-2SinA^2=2CosA^2-1 tan2A=(2tanA)/(1-tanA^2) (注：SinA^2 是sinA的平方 sin2(A) ) 半角公式 tan(A/2)=(1-cosA)/sinA=sinA/(1+cosA); cot(A/2)=sinA/(1-cosA)=(1+cosA)/sinA. sin^2(a/2)=(1-cos(a))/2 cos^2(a/2)=(1+cos(a))/2 tan(a/2)=(1-cos(a))/sin(a)=sin(a)/(1+cos(a))如果觉得以上内容不够详细，可以点击查看三角函数计算公式相关文章，了解更多! 1三角函数数值表 sin,cos,tan不同角度的表值 sin1=0.01745240643728351 sin5=0.08715574274765816 sin10=0.17364817766693033 sin15=0.25881904510252074 sin16=0.27563735581699916 sin21=0.35836794954530027 sin25=0.42261826174069944 sin30=0.49999999999999994 sin35=0.573576436351046 sin40=0.6427876096865392 sin45=0.7071067811865475 sin50=0.766044443118978 sin55=0.8191520442889918 sin60=0.8660254037844386 sin65=0.9063077870366499 sin70=0.9396926207859083 sin75=0.9659258262890683 sin80=0.984807753012208 sin85=0.9961946980917455 sin90=1 cos1=0.9998476951563913 cos5=0.9961946980917455 cos10=0.984807753012208 cos15=0.9659258262890683 cos20=0.9396926207859084 cos25=0.9063077870366499 cos30=0.8660254037844387 cos35=0.8191520442889918 cos40=0.766044443118978 cos45=0.7071067811865476 cos50=0.6427876096865394 cos55=0.5735764363510462 cos60=0.5000000000000001 cos65=0.42261826174069944 cos70=0.3420201433256688 cos75=0.25881904510252074 cos80=0.17364817766693041 cos85=0.08715574274765836 cos90=0 (责任编辑：admin) |