cos75°-sin75°除以 cos75°+ sin75°
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cos75°-sin75°除以cos75°+sin75°cos75°-sin75°除以cos75°+sin75°cos75°-sin75°除以cos75°+sin75°分子分母同乘(cos75-sin
cos75°-sin75°除以 cos75°+ sin75°
cos75°-sin75°除以 cos75°+ sin75°
cos75°-sin75°除以 cos75°+ sin75°
分子分母同乘(cos75-sin75)
原式=(cos75-sin75)²/(cos+sin75)(cos75-sin75)
=(cos²75+sin²75-2sin75cos75)/(cos²75-sin²75)
=[1-sin(2*75)]/cos(2*75)
=(1-sin150)/(cos150)
=(1-1/2)/(-√3/2)
=-√3/3
(cos75°-sin75°)/(cos75°+sin75°)
=(cos75°-sin75°)^2/[(cos75°+sin75°)(cos75°-sin75°)]
=(1-2sin75°cos75°)/(cos^275°-sin^275°)
=(1-sin150°)/cos150°
=(1-sin30°)/(-cos30°)
=(1-1/2)/(-√3/2)
=-√3/3
cos75°-sin75°除以 cos75°+ sin75°
化简:cos83°+sin75°sin8°/cos7°-cos75°cos82°
(cos75°+sin75°)(cos75°-sin75°)
求值:(sin75°-cos75°)/(sin75°+cos75°)
Sin75°/Cos75°+Cos75°/Sin15°=?
Sin75°/Cos75°+Cos75°/Sin15°=?
计算,sin75°*cos75°=
(sin75°-cos75°)分之(sin75°+cos75°)我要具体步骤 在线等
计算:(cos75°+sin75°)乘(cos75°-sin75°)=
化简:sin75°cos75°是sin75°乘cos75°
(cos15°-cos75°)(sin75°+sin15°)=?
sin15°cos75°+cos15°sin75°
sin15°cos75°+cos165°sin75°
根2/2(cos75°+sin75°)的值为
化简(cos83度+sin75度*sin8度)/cos7度-cos75度*cos82度
tan15°、tan75°sin15°、sin75°、cos15°cos75°具体数值
(sin55°+cos75°sin20°)/(cos55°-sin75°sin20°)求值
化简 cos15°cos45°-cos75°sin45° cos15°能否化成sin75°?