若cosa-sina=-1/2,求sin2a
来源:学生作业帮助网 编辑:作业帮 时间:2024/08/05 14:18:44
xAN@Bbbd6qQLFWnh &7L!1
hA;\
NgJ|Q[^
N6̃[@=ֶ#n_/5
/w
sina=2cosa,求(1)3sina+2cosa(2)sin²a+sina×cosa+3
sina+cosa/sina-cosa=2 求sin^2a-2sinacosa+1
若tan=2,求sina+cosa/sina-cosa +(cosa)^2的sina&cosa/sina-cosa 是个整体
tana=sina/cosa=1/4,sin^2+cos^2=1,求sina=?
(1-tana)/(1+tana)=2求(1)sina+cosa/(sina+2cosa) (2)sina-cosa(3)sin^2a-3cos^2a+1
已知tana/tana-1=-1,求下列各式的值(1)sina-3cosa/sina+cosa(2)sin^2a+sina*cosa+2
已知tana/(tana-1)=-1,求下列各式的值(1)sina-3cosa/sina+cosa(2)sin^2a+sina*cosa+2
1:已知sina+cosa=根2求sina cosa sin(4方)a+cos(4方)的值2:已知:sina+cosa=1/5(0
若cos2a/sin(a-π/4)=-根号2/2 求:1.cosa+sina;2.cosa-sina; 3.tana
sin(a+kπ)=2cos[a+(k+1)π].求5cosa+3sina/4sina-2cosa
sin(a+kπ)=2cos[a+(k+1)π].求5cosa+3sina/4sina-2cosa
若sina+cosa/sina-cosa=2,求sinacosa
若tana=2,求sina-cosa/sina+cosa
tana=-1/2,求2cosa-sina/sina+cosa
已知2sina=cosa+1,求sina+cosa
已知sinα=2cosα,求sina+5cosa/-2cosa+sinasina+5cosa/-2cosa+sina
sina+sina=1 求cosa+cosa
若(4sina-2cosa)/(5cosa-sina)=6/13,求(1)tana (2)7sin^2a+4sinacosa-2cos^2a