{sin^2 80°/4(cos40°--cos^3 40°) }(1+根号3tan10°)
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{sin^280°/4(cos40°--cos^340°)}(1+根号3tan10°){sin^280°/4(cos40°--cos^340°)}(1+根号3tan10°){sin^280°/4(co
{sin^2 80°/4(cos40°--cos^3 40°) }(1+根号3tan10°)
{sin^2 80°/4(cos40°--cos^3 40°) }(1+根号3tan10°)
{sin^2 80°/4(cos40°--cos^3 40°) }(1+根号3tan10°)
{sin^2 80°/4(cos40°--cos^3 40°) }(1+根号3tan10°)
={sin^2 80°/[4cos40°(1-cos^2 40°) }(1+根号3tan10°)
={sin^2 80°/[4cos40°sin^2 40°) }(1+根号3tan10°)
={sin^2 80°/[2sin40°cos40°*2sin40°) }(1+根号3tan10°)
={sin^2 80°/[sin80°sin40°) }(1+根号3tan10°)
={sin 80°/sin40° }(1+根号3tan10°)
={cos 10°/sin40° }(1+根号3tan10°)
=(cos 10°+根号3sin10°)/sin40°
=2(cos60°cos10°+sin60°sin10°)/sin40°
=2cos(60°-10°)/sin40°
=2cos50°/sin40°
=2sin40°/sin40°
=2
化简√(1-sin 80°)的结果是A.sin40°+cos40° B.sin40°-cos40° C.cos40°-sin40° D.-sin40°-cos40°
根号(1-2sin40°cos40°)/ (cos40°-根号1-sin^2 50°)
求值(sin^2 80°)(1+√3tan10°)/4(cos40°-cos^3 40°)
{sin^2 80°/4(cos40°--cos^3 40°) }(1+根号3tan10°)
化简:根号下1-2sin40°*cos40°/cos40°- 根号下1-sin^2 50°
求值:sin平方80°/4(cos40°-cos立方40°) ×(1+根号3tan10°)
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化简:根号1+2sin(40°)cos(40°)为什么答案是cos40°-sin40°,而不是sin40°-cos40°?
cos40°等于多少
[sin40﹙1+2cos40﹚]/[2cos?40﹢cos40-1]sin40(1+2cos40)/[2(cos40)^2+cos40-1] =[sin40+2sin40cos40]/[1+cos80 +cos40-1] =[sin40+sin80]/[cos80 +cos40] =[2sin(40+80)/2 *cos(40-80)/2]/[2cos(80+40)/2 *cos(80-40)/2] =[2sin60 *cos20]/[2cos60 *cos20] =[
求sin^2 (10°)+cos^2(40°)+(sin10°)*(cos40°)的值
根号下1-2sin40°cos40°/sin40°-根号下1-sin²40°=
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化简:[sin50°+cos40°(1+根号3tan10°)]/sin²70°
化简:cos40°cos(α-40)° -sin40° sin(40°-α)