sin25π6
sin25π6
计算:sin25π/6+cos25π/4+tan(-25π/4)+sin(-26π/3)
求值sin25π/6+cos25π/3+tan(-25π/4)+sin(-7π/3)×cos(-13π/6)-sin(-
sin25π/6+cos10π/3+tan(-25π/4)+sin(-7π/3)×cos(-13π/6)=
1.化简sin25/12πsin11/6π-cos25/12πcos11/6π的值是
sin25/6pai+cos25/3pai+tan(-25/4pai)
求sin25π/6+cos5π/3+tan(-25π/4)+sin(-7π/3)×cos(-13π/6)-sin(-5π
sin25π/4+cos25π/3+tan(-25π/4)=
sin70°sin65°-sin20°sin25°=( )
sinα的平方加sin25度的平方等于1,求α的度数?
利用和(差)角公式求:sin70度cos25度 - sin20度sin25度
求值s i n70度sin65度-sin 20度sin25度