早教吧作业答案频道 -->数学-->
急(1)4sin54°-5cos36°+根号2sin45°-根号(cos36°-1)方;(2)cos方31°+cos方59°/tan59°×tan31°+tan60°.
题目详情
急
(1)4sin54°-5cos36°+根号2sin45°-根号(cos36°-1)方;
(2)cos方31°+cos方59°/tan59°×tan31°+tan60°.
(1)4sin54°-5cos36°+根号2sin45°-根号(cos36°-1)方;
(2)cos方31°+cos方59°/tan59°×tan31°+tan60°.
▼优质解答
答案和解析
(1)4sin54°-5cos36°+根号2*sin45°-根号(cos36°-1)方;
=4sin54°-5cos36°+根号2*sin45°-根号(cos36°-1)方
=4cos36°-5cos36°+1-1+cos36°
=0
(2)cos方31°+cos方59°/(tan59°×tan31°)+ tan60°
= cos方31°+cos方59°/(tan59°×cot59°)+ tan60°
=cos方31°+cos方59°+ tan60°
=cos方31°+sin方31°+ tan60°
=1+√3
=4sin54°-5cos36°+根号2*sin45°-根号(cos36°-1)方
=4cos36°-5cos36°+1-1+cos36°
=0
(2)cos方31°+cos方59°/(tan59°×tan31°)+ tan60°
= cos方31°+cos方59°/(tan59°×cot59°)+ tan60°
=cos方31°+cos方59°+ tan60°
=cos方31°+sin方31°+ tan60°
=1+√3
看了 急(1)4sin54°-5c...的网友还看了以下:
一道二项式的题1设A=3^7+C(2,7)·3^5+C(4,7)·3^3+C(6,7)·3,B=C 2020-05-21 …
1.比较2∧100与3∧75的大小2.以知3∧x+1=15∧2x-3,求x的值3.下列计算正确的是 2020-06-06 …
14.表达式是满足:当c的值为1、3、5三个数中任意一个时值为“真”,否则值为“假”的表达式A)( 2020-07-13 …
条件等式求值~帮忙做一下...1.已知a+b+c=1,a^2+b^2+c^2=2,a^3+b^3+ 2020-07-24 …
a^3+b^3+c^3-3abc=0=(a+b)^3+c^3-3a^2b-3ab^2-3abc,我 2020-07-31 …
(a+b+c)^3-(b+c-a)^3-(c+a-b)^3-(a+b-c)^3=[(a+b+c)^ 2020-08-02 …
已知a,b,c>0,abc=1,求证:a^3+b^3+c^3≥ab+bc+ca由基本不等式:ab+ 2020-08-03 …
1.已知a*x^3=b*y^3=c*z^3且1/x+1/y+1/z=1求证(a*x^2+b*y^2+ 2020-10-31 …
用计算器计算.c+3=c+3+5=c+3+5+7=c+3+5+7+9=c+3+5+7+9+cc=c+ 2020-10-31 …
比如说将9本书平均分成3组是,C(9,3)C(6,3)C(3,3).那为什么9本书平均分给3个人,是 2020-11-08 …