آلاخونه

hey
aval masahat ro bar asas x,y benevis ke mishe S=2xy bad be tabe x bede v y khroji daryaft kon dar akhr oon ro bezar jaye y ya x

masaln jvab in mishe
S=2xy
y=4-x^2====>
S=2.x. (4-x^2 )
S=8x-4x3

hey
to mosalasi ke 2 ta zavie 45 drge dare 2 zelee mojaver vatar brabrn,,,chon sin va cos oonha brabre

hey
vase inke Fmax dashte bashum bayd hasel zarb q1,q2 max bshe ,,,, ps q1.q2 ro max kon
ke jvabesh mishe gozine 4
chon zrb 2 ebarat vghti max mishe ke brabr bashn yani 3/2q