# 1+2cscx=cotx+3cscx#
#=>sinx( 1+2/sinx)=sinx(cosx/sinx+3/sinx)#
#=>sinx+2=cosx+3#
#=>1/sqrt2sinx-1/sqrt2cosx=1/sqrt2#
#=>cos(pi/4)sinx-sin(pi/4)cosx=sin(pi/4)#
#=>sin(x-pi/4)=sin(pi/4)#
#=>x-pi/4=npi+(-1)^npi/4" where " nin ZZ#
#=>x=npi+(-1)^npi/4+pi/4" where " nin ZZ#