56.37°+23.23°=()°()’不是37秒,是0.37°
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56.37°+23.23°=()°()’不是37秒,是0.37°
(cos20°-cos40°)/(sin20°-sin40°)=?
(cos85°+sin25°cos30°)/cos25°=
(cos7°-cos8°cos15°)/(cos23°-cos8°cos15°)=
(sin22°+cos45°sin23°)/(cos22°-sin45°sin23°)=
(tan20°+tan40°+tan120°)/(tan20°tan40°)=
58°18′=()°
76°30’27’’=()° 32.28°=()°()’()’’
2sin20°+(cos10°/cos20°)=
tan30°/(1-tan30°×tan30°)=?
cot45°/(tan45°-sin60°)=?
sin140°cos20°+sin50°sin20°=sin(90°+50°)cos20°+sin50°sin20°=cos(50°-20°)sin140°cos20°+sin50°sin20°=sin(90°+50°)cos20°+sin50°sin20°=cos(50°-20°)
求(tan20°+tan40°+tan120°)/tan20°tan40°的值(tan20°+tan40°+tan120°)/tan20°tan40°=[tan60°(1-tan20°tan40°)-tan60°]/(tan20°tan40°)=-(tan60°tan20°tan40°)/(tan20°tan40°)=-tan60°=-√3
sina(-1770°)×cos1500°+cos(-690°)×sin780°+tan405°=
120°=()°直角=()°平角=()°周角
27°27’=( )° 怎么算?28.28°( )°( )’( )”
cos20°cos40°cos60°cos80° =(sin20cos20cos40cos60cos80)/sin20.(乘以sin20°.再除以sin20°) =(sin40°cos40°cos60°cos80°)/2sin20°.(2倍角公式) =(sin80°cos60°cos80°)/4sin20°.(2倍角公式) =(sin160°cos60°)/8sin20°.(2
为什么cos(90°-8°)=sin8° cos(180°-8°)=-cos8°