作业帮已知2sin²a+2sinacosa/1+tana=k(0
来源：学生作业帮助网 编辑：作业帮 时间：2024/10/06 10:47:49
x){}K3ԊK AD}CļDl
"}bِd.XE``Q
ԏFX$ >kk35mm|1=6yvP9H`m7iX?/xdܚZ6A2 >
已知2sin²a+2sinacosa/1+tana=k(0
已知2sin²a+2sinacosa/1+tana=k(0
已知2sin²a+2sinacosa/1+tana=k(0
2sin²a+2sinacosa/1+tana
=2sina(sina+cosa)/[(sina+cosa)/cosa]
=2sinacosa
k=2sinacosa
(sina-cosa)^2=1+k
sina-cosa=±√（1+k）
已知2sin²a+2sinacosa/1+tana=k(0