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) 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) sin（a-b）sin（b-r）-cos（a-b）cos（r-b) 化简COS(a+B)COS(a-B)+sin平方B 化简cos(a+b)cos(a-b)+sin^2b 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, 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^4a-cos^4b 化简sin^2a+sin^2b-sin^2a*sin^2b+cos^2a*cos^2b sin^2a+sin^2b-sin^2a * sin^2b+cos^2a * cos^2b 化简 化简cos(a-B)cos(a-y)-sin(a-B)sin(y-a) 化简（sin(a-b)-2sin a cos b）/2sin a sin b +coa(a+b) 化简sin^2acos^b-cos^2asin^2b+cos^a-cos^2b 化简sin(a-b)*cosa - cos(a-b)*sina 化简[sin(2A+B)]/sinA-2cos(A+B)