In[]:=
LHS=c1M1+
1
-M1
2
Sin[°α1]
+Cos[°α1]
1-
2
M1
2
Sin[°α1]
Out[]=
c1M1+
1
-M1
2
Sin[°α1]
+Cos[°α1]
1-
2
M1
2
Sin[°α1]
In[]:=
RHS=c2(1+M2)
Out[]=
c2(1+M2)