Răspunsuri

2014-01-21T20:58:24+02:00
Poate te pot ajuta formulele astea:
sin(a+b)=cos(b)sin(a)+cos(a)sin(b)
sin(2a)=2sin(a)cos(a)
cos(2a)=cos^2(a)-sin^2(a)
cos(a-b)=cos(a)cos(b)+sin(a)sin(b)
tg(a+b)=[sin(a)cos(b)]/[cos(a)cos(b)-sin(a)sin(b)]+[cos(a)sin(b)]/[cos(a)cos(b)-sin(a)sin(b)]