若sina+cosa=1/2,则sin(a+π/4)=?
来源:学生作业帮 编辑:搜搜做题作业网作业帮 分类:数学作业 时间:2024/07/16 17:26:03
若sina+cosa=1/2,则sin(a+π/4)=?
![若sina+cosa=1/2,则sin(a+π/4)=?](/uploads/image/z/9285267-3-7.jpg?t=%E8%8B%A5sina%2Bcosa%3D1%2F2%2C%E5%88%99sin%EF%BC%88a%2B%CF%80%2F4%EF%BC%89%3D%3F)
若sina+cosa=1/2
则sin(a+π/4)=sinacos(π/4)+cosasin(π/4)=(√2/2)*(sina+cosa)=(√2/2)*(1/2)=√2/4
如果不懂,祝学习愉快!
则sin(a+π/4)=sinacos(π/4)+cosasin(π/4)=(√2/2)*(sina+cosa)=(√2/2)*(1/2)=√2/4
如果不懂,祝学习愉快!
若sina+cosa=1/2,则sin(a+π/4)=?
若sinA+cosA/sinA-cosA=2,则sin(A-5π)*sin(3π/2-A)等于?
sinA+cosA=1/2,则sin(A+π/4)=?
若(sina+cosa)/(sina -cosa)=2,则 sin(a-5π)*(乘) sin(3π/2 - a)等于?
若sina+cosa/sina-cosa=2,则sin(a-5π)×sin(二分之三派-a)等于?请给出具体过程
(2sin^2a+sin2a)/(1+tana) 整理 =[2sina(sina+cosa)]/[(sina+cosa)
若(sina+cosa)/(sina-cosa)=2,则sin(a-5pai)*sin(3pai/2-a)等于?
若(sina+cosa)/(sina-cosa)=2,则sin(a-5派)*sin(3派/2-a)等于?
若sin(a-π/4)/cos2a=-根号2,则sina+cosa=
若cos2a/sin(a-π/4)=-√2/2,则cosa+sina等于多少?
若cos2a/sin((a-(π/4))=-(√2)/2,则cosa+sina的值为
cos2a/sin(a-π/4) =-根号(2)/2,则cosa+sina的值为?