sin(x)+cos(x)=2/3 根号2倍(sin(2x-π/4)+1)/1+tan(x)=?2sin(x)*cos(x)+2sin(x)^2)/(1+tan(x))=2sin(x)*cos(x)怎么来的。
来源：学生作业帮助网 编辑：六六作业网 时间：2024/11/23 22:21:20
sin(x)+cos(x)=2/3 根号2倍(sin(2x-π/4)+1)/1+tan(x)=?2sin(x)*cos(x)+2sin(x)^2)/(1+tan(x))=2sin(x)*cos(x)怎么来的。
sin(x)+cos(x)=2/3 根号2倍(sin(2x-π/4)+1)/1+tan(x)=?
2sin(x)*cos(x)+2sin(x)^2)/(1+tan(x))
=2sin(x)*cos(x)
怎么来的。
sin(x)+cos(x)=2/3 根号2倍(sin(2x-π/4)+1)/1+tan(x)=?2sin(x)*cos(x)+2sin(x)^2)/(1+tan(x))=2sin(x)*cos(x)怎么来的。
根号2倍(sin(2x-π/4)+1)/1+tan(x)
=(sin(2x)-cos(2x)+1)/(1+tan(x))
=(2sin(x)*cos(x)+2sin(x)^2)/(1+tan(x))
=2sin(x)*cos(x)
又∵sin(x)+cos(x)=2/3
∴2sin(x)*cos(x)=(2/3)^2-1=-5/9
∴根号2倍(sin(2x-π/4)+1)/1+tan(x)=-5/9
NEW YORK (Reuters) - Shares of Citigroup (C.N) rose 2.7 percent before the bell on Monday after Goldman Sachs raised its rating on the stock. Hot StocksShares were up at $3.85 after closing at $3.75.(...
全部展开
NEW YORK (Reuters) - Shares of Citigroup (C.N) rose 2.7 percent before the bell on Monday after Goldman Sachs raised its rating on the stock. Hot StocksShares were up at $3.85 after closing at $3.75.(Reporting by Caroline Valetkevitch; Editing by James Dalgleish)Hot Stocks
The Relative News:
wow power leveling ?
Beijing time on May 19
wow power leveling 020 001
power leveling Paul is 15% of the study
power leveling " said Jack B. Moore
收起
根号2倍(sin(2x-π/4)+1)/1+tan(x)
=(sin(2x)-cos(2x)+1)/(1+tan(x))
=(2sin(x)*cos(x)+2sin(x)^2)/(1+tan(x))
=2sin(x)*cos(x)
又∵sin(x)+cos(x)=2/3
∴2sin(x)*cos(x)=(2/3)^2-1=-5/9
∴根号2倍(sin(2x-π/4)+1)/1+tan(x)=-5/9