作业帮求下列各角的正弦、余弦、正切值
来源：学生作业帮 编辑：拍题作业网作业帮 分类：数学作业 时间：2024/04/29 12:53:34
求下列各角的正弦、余弦、正切值
750° 、17π/4、-11π/6、-1020°
750° 、17π/4、-11π/6、-1020°
sin750°=sin(720°+30°)=sin30°=1/2
cos750°=cos(720°+30°)=cos30°=根号3/2
tan750°=tan(720°+30°)=tan30°=根号3/3
sin17π/4=sin(16π/4+π/4)=sin(π/4)=根号2/2
cos17π/4=cos(16π/4+π/4)=cos(π/4)=根号2/2
tan17π/4=tan(16π/4+π/4)=tan(π/4)=1
sin(-11π/6)=sin(-12π/6+π/6)=sin(π/6)=1/2
cos(-11π/6)=cos(-12π/6+π/6)=cos(π/6)=根号3/2
tan(-11π/6)=tan(-12π/6+π/6)=tan(π/6)=根号3/3
sin(-1020°)=sin(-1080°+60°)=sin60°=根号3/2
cos(-1020°)=cos(-1080°+60°)=cos60°=1/2
tan(-1020°)=tan(-1080°+60°)=tan60°=根号3
cos750°=cos(720°+30°)=cos30°=根号3/2
tan750°=tan(720°+30°)=tan30°=根号3/3
sin17π/4=sin(16π/4+π/4)=sin(π/4)=根号2/2
cos17π/4=cos(16π/4+π/4)=cos(π/4)=根号2/2
tan17π/4=tan(16π/4+π/4)=tan(π/4)=1
sin(-11π/6)=sin(-12π/6+π/6)=sin(π/6)=1/2
cos(-11π/6)=cos(-12π/6+π/6)=cos(π/6)=根号3/2
tan(-11π/6)=tan(-12π/6+π/6)=tan(π/6)=根号3/3
sin(-1020°)=sin(-1080°+60°)=sin60°=根号3/2
cos(-1020°)=cos(-1080°+60°)=cos60°=1/2
tan(-1020°)=tan(-1080°+60°)=tan60°=根号3