神马作文网1.sin0°=0 2.sin90°=1 3.sin180°=0 4.cos
来源：学生作业帮助网 编辑：作业帮 时间：2024/11/13 00:23:35
sin0度=0sin90度=1sin180度=0sin270度=-1sin360度=0cos0度=1cos90度=0cos180度=-1cos270度=0cos360度=1tan0度=0tan90度=
原式=[cos15sin9+sin(15-9)]/[sin15sin9-cos(15-9)]=(cos15sin9+sin15cos9-cos15sin9)/(sin15sin9-cos15cos9-
∵sinC=2sin0.5C×cos0.5C,cosC=cos0.5C×cos0.5C-sin0.5C×sin0.5C∴2sin0.5C×cos0.5C+cos0.5C×cos0.5C-sin0.5C
cos66=sin24sin24=sin15*cos9+sin9*cos15sin15*cos9-cos66=-sin9*cos15sin66=cos24cos24=cos15*cos9-sin15*
cos8°=cos(17°－9°)=cos17°cos9°＋sin17°sin9°则：原式=[cos17°cos9°]/[cos9°]=cos17°
Sin0=0.Cos0=1.Tan0=0.Sin90=1.Cos90=0.Tan90不存在
sin24=sin9cos15+cos9sin15cos24=cos9cos15-sin9sin15原式等于-cos9sin15/cos9cos15=-tan15
a+b=(cos1.5x+cos0.5x,sin1.5x-sin0.5x),所以la+bl^2=(cos1.5x+cos0.5x)^2+(sin1.5x-sin0.5x)^2=2+2cos2x=2-2
线性插值结果：0.33036520000000（在MATLAB中直接使用插值命令）抛物线插值：0.33037436203750（进行二次曲线拟合,然后代入求值）再问：用计算机语言编写程序咋编再答：我是
cos66=sin24sin24=sin15*cos9+sin9*cos15sin15*cos9-cos66=-sin9*cos15sin66=cos24cos24=cos15*cos9-sin15*
(sin6+cos15*sin9)/(cos6-sin15*sin9)=[sin(15-9)+cos15*sin9]/[cos(15-9)-sin15sin9]=(sin15cos9-cos15sin
1、sin0°=02、sin90°=13、sin180°=04、cos0°=15、cos90°=06、cos180°=-17、sin-30°=-1/28、sin-45°=-√2/29、sin-60°=
原式=[cos15sin9+sin(15-9)]/[sin15sin9-cos(15-9)]=(cos15sin9+sin15cos9-cos15sin9)/(sin15sin9-cos15cos9-
两边同时乘以P
sin90=1sin0=0tan90无意义(tan90=sin90/cos90,cos90=0所以无意义）tan0=0
因a为锐角,故sina>0,cosa>0,所sina+2√1-sin²a=2,即2√1-sin²a=2-sina,两边平方得,5sin²a-4sina=0,解得,sina
sin9+sin6cos15=sin(15-6)+sin6cos15=sin15cos6-sin6cos15+sin6cos15=sin15cos6cos9-sin6sin15=cos(15-6)-s