sin^4+sin^2cos^2+cos^2a=
来源：学生作业帮助网 编辑：六六作业网 时间：2024/05/12 11:04:41
sin^4+sin^2cos^2+cos^2a=sin^4+sin^2cos^2+cos^2a=sin^4+sin^2cos^2+cos^2a=原式=sin²a(sin²a+cos
sin^4+sin^2cos^2+cos^2a=
sin^4+sin^2cos^2+cos^2a=
sin^4+sin^2cos^2+cos^2a=
原式 = sin²a(sin²a + cos²a) + cos²a
= sin²a · 1 + cos²a
=sin²a+cos²a
=1
sin^4a+sin^2acos^2a+cos^2a=sin^2a(sin^2a+cos^2a )+cos^2a=sin^2a+cos^2a=1
题目有点问题哦！