作业帮化简cos(a+b)cos(a-b)+sin^2b
来源：学生作业帮助网 编辑：作业帮 时间：2024/09/30 17:51:20
x){3bD$M0]gdTO@~
1 &q.P44Bp!-@8D0 @q҆p0m ^sPDf#@ Db*hFۣI@ d)
化简cos(a+b)cos(a-b)+sin^2b
化简cos(a+b)cos(a-b)+sin^2b
化简cos(a+b)cos(a-b)+sin^2b
cos(a+b)cos(a-b)+sin^2b
=(cosacosb-sinasinb)(cosacosb+sinasinb)+sin^2b
=cos^2acos^2b-sin^2asin^2b+sin^2b
=cos^2acos^2b+cos^2asin^2b
=cos^2a
原式=1/2(cos2a+cos2b)+1/2(1-cos2b)
=1/2cos2a+1/2
=cos^2a
☆⌒_⌒☆ 希望可以帮到you~
sin（a B)sin(B-y)-cos(a B)cos(y-B) =sin（a B)sin(B-y)-cos(a B)cos(B-y) =-cos(a B B-y) =-cos(a 2B-y) sin(a B
化简COS(a+B)COS(a-B)+sin平方B
化简cos(a+b)cos(a-b)+sin^2b
化简：2cos(A+B)cosB-cos(2A+B)
COS(a-B)公式
证明cos(A+B)
cos a-cos b 公式是什么?
cos(a+b)+cos(a-b)/sin(a+b)+sin(a-b)化简
化简 cos(a-b)cos(a+b)+sin(a-b)sin(a+b).
cos(a-b)cos(a+b)+sin(a-b)sin(a+b)化简,
化简sin^2acos^b-cos^2asin^2b+cos^a-cos^2b
化简 cos(a+b)cosa+sin(a+b)sina=_______ cos(31°-a)cos(29°+a)-cos(59°+a)cos(61°-a)
sin(a+B)cos(y-B)-cos(B+a)sin(B-y) 化简
sin（a+B)sin(B-y)-cos(a-B)cos(y-B) 化简
化简,sin(a+b)cos(r-b)-cos(b+a)sin(b-r)
化简 ：sin(a+b)cos(r-b)-cos(b+a)sin(b-r) sin(a-b)sin(b-r)-cos(a-b)cos(r-b)sin(a+b)cos(r-b)-cos(b+a)sin(b-r) 和 sin(a-b)sin(b-r)-cos(a-b)cos(r-b)
证明：cos(a+b)*cos(a-b)=cos2b-cos2a
如何证明|cos a-cos b | ≤| a - b
帮我证明|cos a-cos b | ≤| a - b |