计算或化简谢谢!求过程计算或化简1.根号3cos30°+根号2sin45°2.sin60°分之tan45°-cos60°×tan30°3(sin60°+cos45°)(sin60°-cos45°) 谢谢
问题描述:
计算或化简谢谢!求过程
计算或化简
1.根号3cos30°+根号2sin45°
2.sin60°分之tan45°-cos60°×tan30°
3(sin60°+cos45°)(sin60°-cos45°) 谢谢
答
﹙1﹚原式=3×√3/2+√2×√2/2=3√3/2+1
﹙2﹚原式=1/﹙√3/2﹚-1/2×√3/3=√3/2
﹙3﹚原式=﹙√3/2+√2/2﹚×﹙√3/2-√2/2﹚=1/4.
答
1.根号3cos30°+根号2sin45°=√3*√3/2+√2*√2/2=3/2+1=5/22.sin60°分之tan45°-cos60°×tan30°=1/(√3/2)-1/2*√3/3=2√3/3-√3/6=√3/23(sin60°+cos45°)(sin60°-cos45°) =sin²60°-cos²45...