tan²30°+2sin60°Xcos45°+sin30°Xcos30°
|cos45°-sin60°|+根号sin30°
sin30°-sin60°=?
sin30°cos60°+cos30°sin60°=
sin30°+sin60°=sin90°吧?
2sin30°·cos45°-(sin60°)负二次方+根号3tan30°
计算:sin60°-cos60°+2sin30°cos30° 根号三sin60°-根号2cos45°+根号8的立方
tan30° sin30° cos30° tan60° sin60° cos60° tan45°
sin60°×cos60°+sin45°×cos45°-sin30°×cos30°等于多少
计算10sin60°-6cos30° sin30°+cos60°-cos30°sin45°
sin30° sin45° sin60° cos30° cos45° cos60° 以此类推,都等于多少
【sin30°/(sin60°-cos45°)】—(根号下(1—tan60°)²)—tan45°
计算下列各式 sin30°*cos30°-(√2)/2 sin45°-cos60°*sin60°