已知tana=2(1)sina+3cosa/sina-cosa(2)sin²a+sinacosa+3cos²a已知tana=2(1)sina+3cosa/sina-cosa(2)sin²a+sinacosa+3cos²a
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/30 22:58:02
![已知tana=2(1)sina+3cosa/sina-cosa(2)sin²a+sinacosa+3cos²a已知tana=2(1)sina+3cosa/sina-cosa(2)sin²a+sinacosa+3cos²a](/uploads/image/z/1802061-45-1.jpg?t=%E5%B7%B2%E7%9F%A5tana%3D2%EF%BC%881%EF%BC%89sina%2B3cosa%2Fsina-cosa%EF%BC%882%EF%BC%89sin%26%23178%3Ba%2Bsinacosa%2B3cos%26%23178%3Ba%E5%B7%B2%E7%9F%A5tana%3D2%EF%BC%881%EF%BC%89sina%2B3cosa%2Fsina-cosa%EF%BC%882%EF%BC%89sin%26%23178%3Ba%2Bsinacosa%2B3cos%26%23178%3Ba)
已知tana=2(1)sina+3cosa/sina-cosa(2)sin²a+sinacosa+3cos²a已知tana=2(1)sina+3cosa/sina-cosa(2)sin²a+sinacosa+3cos²a
已知tana=2(1)sina+3cosa/sina-cosa(2)sin²a+sinacosa+3cos²a
已知tana=2
(1)sina+3cosa/sina-cosa
(2)sin²a+sinacosa+3cos²a
已知tana=2(1)sina+3cosa/sina-cosa(2)sin²a+sinacosa+3cos²a已知tana=2(1)sina+3cosa/sina-cosa(2)sin²a+sinacosa+3cos²a
(1)sina+3cosa/sina-cosa
=(tana+3)/(tana-1)
=(2+3)/(2-1)
=5
(2)sin²a+sinacosa+3cos²a
=(sin²a+sinacosa+3cos²a)/(sin²a+cos²a)
=(tan²a+tana+3)/(tan²a+1)
=(4+2+3)/(4+1)
=9/5
(1)sina+3cosa/sina-cosa=t+3/t-1=5
sin²a+sinacosa+3cos²a=sin²a+sinacosa+3cos²a
____________________
...
全部展开
(1)sina+3cosa/sina-cosa=t+3/t-1=5
sin²a+sinacosa+3cos²a=sin²a+sinacosa+3cos²a
____________________
sin²a+cos²a
t平方+t+3
————— =9/5 t代表 tana
t平方 +1
收起