Bart was in love. He’d spend the time between interminably long phone calls mooching around and texting, as those in love sometimes do. He would wait, and then… The phone was never answered before with such speed lightning.
Donna was her name. They were both studying Mathematics at university. They shared the same mathematical problems on the phone. They shared the same solutions. Mathematics was never so superficial.
It was like life; they invented problems so they could solve them together. Things went swimmingly until Donna suggested:
f(x)=a_0+∑_(n=1)^∞▒(a_n cos〖nπx/L〗+b_n sin〖nπx/L〗 )
In response, last Thursday, Bart came up with:
cosα+cosβ=2 cos〖1/2 (α+β)〗 cos〖1/2 (α-β)〗
Quite frankly Donna had had enough. She was fed up to the eyeballs. She called the whole thing off.