la vita e bella 22:38 29 May 2013 #1
a) sin4x/(1-cos4x)=?
b) (1+cos2x)/(1-cos2x)=?
b) (1+cos2x)/(1-cos2x)=?
Süleyman Oymak 15:08 30 May 2013 #2 
la vita e bella 22:38 29 May 2013 #1 Süleyman Oymak 15:08 30 May 2013 #2