求值tan450°-sin450°+cos750°
1.Tan300°+sin450°=
化简:sin420°乘cos750°+sin(-330°)乘cos(-660°)乘tan(225°)
1.化简:(sin450°-α)-sin(180°-α)+cos(450°-α)+cos(180°-α)的值
求值:cos20°sin20°
求值:cos40°(1+3tan10°)
tan36°tan72°求值要过程
求值:sin10°sin50°sin70°sin80°
求值:(2sin80°-cos70°)/cos20°
求值:sin10°sin50°·sin70°
sin10°sin50°sin70° 怎样化简求值?
正弦函数求值sin10°*sin50°*sin70°
求值:(tan10°-根号3)cos10°÷sin50°