Generalized power series
Expansions at sin(theta/2)==0
Expansions at cos(theta/2)==0
Expansions at tan(theta/2)==0
Expansions at cot(theta/2)==0
Expansions at sin(theta)==0
Expansions at cos(theta)==0
Expansions at tan(theta)==0
Expansions at cot(theta)==0
Expansions at theta==0
Expansions at cos(theta)==infinity
