2cos60°+tan30°-sin60°
tan30° sin30° cos30° tan60° sin60° cos60° tan45°
不用计算器求值:tan30°+sin60°1−cos60°
sin60 sin30 cos60 cos30 sin45 cos45 tan30 tan60 tan45°各等于多少
Sin30°=?;Sin45°=?;Sin60°=?;Cos30°=?;Cos45°=?;Cos60°=?;tan30°
sin30°cos60°+cos30°sin60°=
计算cos45°-cos60°分之sin30°-2sin45°+根号3tan30°
cos60°+tan60° 2/根号2sin45°+sin60°-2cos45°
2sin30°·cos45°-(sin60°)负二次方+根号3tan30°
计算:cos60゜1+sin60゜+1tan30゜
(1)sin60°-tan45°; (2)cos60°+tan60°; (3)根号2 /2 sin45°+sin60°-
计算:sin60°-cos60°+2sin30°cos30° 根号三sin60°-根号2cos45°+根号8的立方
计算下列各式 sin30°*cos30°-(√2)/2 sin45°-cos60°*sin60°