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sin40°化简
化简sin40°
(tan10°-√3)
答:
sin40°
乘于(tan10°-根号3)=sin40°*(sin10°/cos10°-sin60°/cos60°)=sin40°[(sin10°cos60°-cos10
°sin
60°)/cos10°cos60°]=sin40°*(-sin50°)/(1/2*cos10°)=-2sin40°sin50°/cos10° =-2sin40°cos40°/cos10° =-sin80°/cos10° =-1 ...
怎么
化简
的?
答:
因为sin(90°-x)=cosx 所以sin(90°-50°)=cos50°
sin40°
=cos50° 然后分子分母同乘一个cos40° sin40°=(sin40°cos40°)/cos40° tan40°=sin40°/cos40° 这就是第一步的
化简
。
化简sin40
度(tan10度减根号3)跪求
答:
解:
sin40°
(tan10°-√3)=sin40°(sin10°/cos10°-√3)=sin40°(sin10°-√3cos10°)/cos10° =2sin40°[sin10°cos60°-cos10
°sin
60°]/cos10° =2sin40*sin(-50°)/cos10° =-2sin40°cos40°/cos10° =-sin80°/cos10° =-1 ...
化简sin
400
°sin
(?230°)cos850°tan(?50°)的结果为__
答:
原式=sin(360°+40°)sin(?360°+130°)cos(2×360°+130°)(?tan50°)=
sin40°
sin130°cos130°(?tan50°)=sin40°sin50°?cos50°(?sin50°cos50°)=sin40°.故答案为:sin40°.
化简
:
sin40
度(根号3-tan10度)=?
答:
sin40(sin60/Cos60-sin10/cos10 )=Sin40/(Cos10Cos60) (Cos10Sin60-Sin 10 Cos60 )=Sin40 Sin 50/ (Cos10 Cos60)=Sin40 Cos40 / (Sin80 Cos 60)= Sin80/ 2 /(Sin80 Cos 60)= 1/(2Cos60)=1 原式=
sin40°
(tan60°-tan10°)=sin40°(sin(60°-10°)/(cos10°cos60...
化简
:
sin40°
(tan10°-tan60°)
答:
=
sin40°
(tan10°-根号3)=sin40*sin10/cos10-根号3*sin40 =sin40*cos80/cos10-根号3*sin40 =sin40*cos80/2sin40*cos40-根号3*sin40 =(1/2)*cos80/cos40-根号3*sin40 =[(1/2)*cos80-根号3sin40*sin40]/cos40 =[(1/2)cos80-根号3/2*sin80]/cos40 =(sin30*cos80-cos...
化简sin40
(tan10-√3)
答:
原式=
sin40°
(tan10°-tan60°)=sin40°(sin(10°-60°)/(cos10°cos60°))=2sin40°sin(-50°)/cos10° =-2sin40°cos40°/sin80° =-sin80°/sin80° =-1
sin40
º(tan10º-√3)怎样
化简
答:
解:
sin40°
(tan10°-√3)=sin40°(sin10°/cos10°-√3)=sin40°(sin10°-√3cos10°)/cos10° =2sin40°[sin10°cos60°-cos10
°sin
60°]/cos10° =2sin40*sin(-50°)/cos10° =-2sin40°cos40°/cos10° =-sin80°/cos10° =-1 ...
化简
:
sin40°
(tan10°− 3 ) =___.
答:
sin40°
(tan10°−3)=sin40°(sin10°cos10°−3)=sin40°•sin10−3cos10°cos10°=2sin40°(12sin10°−32cos10°)cos10°=2sin40°sin(10°−60°)cos10°=−2sin40°sin50°cos10°=−sin40°cos40°cos10°×...
(1)
sin40
度(ta n10度-根号下3) (2)tan70度cos10度(根号下3*tan20度...
答:
(1)
sin40
(sin10/cos10 - sin60/Cos60)=
Sin40
/(Cos10Cos60) (Sin 10 Cos60 - Cos10Sin60)=Sin40 Sin (-50)/ (Cos10 Cos60)=-Sin40 Cos40 / (Sin80 Cos 60)= - Sin80/ 2 /(Sin80 Cos 60)= - 1/(2Cos60)=-1 (2)Sin70/Cos70 Cos10 * (Sin 60/Cos60 Sin20 /...
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