计算 2sin10+cos10+tan20sin10,
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计算 2sin10+cos10+tan20sin10,
计算 2sin10+cos10+tan20sin10,
计算 2sin10+cos10+tan20sin10,
2sin20°+cos10°+tan20sin10°
=2sin20°+cos10°+sin20sin10°/cos20°
=2sin20°+(cos20°cos10°+sin20sin10°)/cos20°
=2sin20°+cos(20°-10°)/cos20°
=2sin20°+cos10°/cos20°
=(2sin20°cos20°+cos10°)/cos20°
=(sin40°+cos10°)/cos20°
=(sin40°+sin80°)/cos20°
=2sin[(40°+80°)/2]*cos[(40°-80°)/2]/cos20°
=2sin60°*cos20°/cos20°
=2*√3/2
=√3
计算 2sin10+cos10+tan20sin10,
计算2sin10°+cos10°+tan20°sin10°
咋由2sin10/cos10得到2sin10 cos10
(sin10+cos10)/(cos10-sin10)=?
cos20/(cos10+sin10)+sin10
根号下(sin10度-cos10度)^2=为什么是cos10度-sin10度不是sin10度-cos10度
(sin20-1/2cos10)/sin10化简
求值:(2cos10-sin10)/cos20
2*sin10*cos10等于sin多少?
计算1/(sin10°)-(根号3)/(cos10°)的值.
为什么sin50(cos10+√3sin10)/cos10=sin50*2sin(10+30)/cos10
根号1-2sin10度cos10度 除以sin10度-根号1-sin10度的平方
(sin20*sin10)/(cos20*cos10)
sin10=?cos10=?
sin10*cos10=
计算:1/(sin10°)--√3/(cos10°) cos20°cos40°cos80°(1).1/(sin10°)--√3/(cos10°) (2).cos20°cos40°cos80°
(cos10-2sin30cos10+2cos30sin10)/2sin10=cos30
2sin50°+2sin10°sin40°/cos10°