必修4数学:求函数y=(2cosX)/(sinX-cosX)的定义域.
必修4数学:求函数y=(2cosX)/(sinX-cosX)的定义域.
由sinX-cosX≠0怎么变化到根号2sin(X-pi/4)≠0,只要叫我这一步就ok,现在对三角函数还不怎么熟练呀
由sinX-cosX≠0怎么变化到根号2sin(X-pi/4)≠0,只要叫我这一步就ok,现在对三角函数还不怎么熟练呀
数学人气:556 ℃时间:2019-10-11 05:23:24
优质解答
y=(2cosX)/(sinX-cosX) sinX-cosX≠0 根号2(根号2/2sinX-根号2/2cosX)≠0 根号2(sinxcos45-cosxsin45)≠0 根号2sin(X-pi/4)≠0
我来回答
类似推荐
猜你喜欢
- 1When ______into a warm room ,the ice is soon changed to water.
- 2f(x)=clnx+1/2x^2+bx(c不等于0) ,x=1时是极值点,f(x)=0恰有两解,求c的范围
- 3实验室用KClO3,MnO2 制取氧气,若MnO2在原混合物中的质量
- 4英语连词成句:stands,in,the,front,of,the,classroom,student,the.
- 5reading are in they study the books连词成句
- 6Linda didn't want to tell that to the teacher.She is ( ) what she should do.
- 7有2√1吗计算(x+1)(x-1)=2√2x
- 8连续动作词的句子有.
- 9My Friend Wants a Chinese Name ,His English Name is Jason Rivergates ,can you help?
- 10斜面上力对物体做的功是什么功,是有用功还是总功