已知sina-cosa=1/2,则sin²a-cos²a=?
题目
已知sina-cosa=1/2,则sin²a-cos²a=?
答案
举一反三
已知函数f(x)=x,g(x)=alnx,a∈R.若曲线y=f(x)与曲线y=g(x)相交,且在交点处有相同的切线,求a的值和该切线方程.
我想写一篇关于奥巴马的演讲的文章,写哪一篇好呢?为什么好
最新试题
热门考点
- 你不知道我这几年是怎么过来的.翻译成英语
- do you have any problems ______(fly) kites...急
- He read the paper yesterday.He said so.(合并为一句)
- There are some books on the desk.改为否定句
- 烷烃,烯烃,炔烃的物理性质
- 91的因数有哪些
- The mere fact __most people believe nuclear war would be madness does not mean that it will no occu
- cos2x=cosx的解的个数
- 已知三角形ABC中,AB等于AC,AD是BC边上的中线,CF//BA,BF交AD于点P,交AC于点E,求证B乘P的平方等于PE乘PF
- if i have a cold ,i am not going to go to school还是if i have a cold ,i am not going to school