锟斤拷锟斤拷锟斤拷(ji锟斤拷n)锟轿的撅拷(xi锟斤拷n)锟斤拷規(gu锟斤拷)锟斤拷锟斤拷(w锟斤拷n)锟絵锟角高匡拷锟侥燂拷锟絚(di锟斤拷n)之一锟斤拷锟角歷锟斤拷呖锟斤拷谋乜锟斤拷锟�(n锟斤拷i)锟捷ｏ拷锟斤拷要锟斤拷锟斤拷锟斤拷}锟斤拷锟斤拷式锟斤拷锟斤拷锟筋優(y锟斤拷u)锟斤拷锟斤拷锟街碉拷(l锟斤拷i)锟斤拷(w锟斤拷n)锟絵锟斤拷锟斤拷锟�锟斤拷锟竭匡拷锟斤拷锟斤拷锟絵锟斤拷要锟斤拷锟紷锟斤拷(xi锟斤拷n)锟斤拷規(gu锟斤拷)锟斤拷知锟絉(sh锟斤拷)要锟絚(di锟斤拷n)锟斤拷锟斤拷锟铰幾傦拷(g锟斤拷)锟斤拷锟芥：

锟斤拷锟斤拷(1) 锟斤拷規(gu锟斤拷)锟侥撅拷(xi锟斤拷n)锟斤拷規(gu锟斤拷)锟斤拷锟斤拷(w锟斤拷n)锟絵锟斤拷锟斤拷锟斤拷锟节撅拷(xi锟斤拷n)锟皆約锟斤拷锟絣锟斤拷锟铰碉拷锟斤拷值锟斤拷(w锟斤拷n)锟絵;

锟斤拷锟斤拷(2) 锟絚锟斤拷锟斤拷(sh锟斤拷)锟斤拷平锟斤拷锟斤拷锟斤拷锟斤拷知锟絉(sh锟斤拷)锟結(ji锟斤拷)锟较碉拷锟斤拷值锟�(l锟斤拷i)锟斤拷(w锟斤拷n)锟絵;

锟斤拷锟斤拷(3) 锟斤拷锟节非撅拷(xi锟斤拷n)锟皆約锟斤拷锟絣锟斤拷锟铰碉拷锟斤拷值锟斤拷(w锟斤拷n)锟絵;

锟斤拷锟斤拷(4) 锟斤拷锟介線(xi锟斤拷n)锟斤拷規(gu锟斤拷)锟斤拷锟斤拷(w锟斤拷n)锟絵锟节斤拷Q锟斤拷(sh锟斤拷)锟紿锟斤拷锟斤拷锟斤拷锟斤拷锟絘(ch锟斤拷n)锟斤拷(sh锟斤拷)锟紿锟叫的戯拷(y锟斤拷ng)锟斤拷.锟斤拷锟斤拷锟叫的碉拷(2)(3)(4)锟絚(di锟斤拷n)锟斤拷锟斤拷锟斤拷锟斤拷锟絵锟侥勶拷(chu锟斤拷ng)锟斤拷锟絚(di锟斤拷n)锟斤拷

锟斤拷锟斤拷锟斤拷锟斤拷1锟斤拷 锟絆(sh锟斤拷)锟斤拷锟斤拷(sh锟斤拷)f(θ)=?3?sin?θ+??cos?θ锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷θ锟斤拷锟斤拷c(di锟斤拷n)锟絚锟斤拷锟斤拷(bi锟斤拷o)原锟絚(di锟斤拷n)锟截合ｏ拷始邊锟絚x锟絊锟斤拷負(f锟斤拷)锟斤拷锟絊锟截猴拷锟斤拷锟終邊锟斤拷(j锟斤拷ng)锟絕(gu锟斤拷)锟絚(di锟斤拷n)?P(x,y)?锟斤拷锟斤拷0≤θ≤?π?锟斤拷

锟斤拷锟斤拷(1) 锟斤拷锟絚(di锟斤拷n)P锟斤拷锟斤拷锟斤拷(bi锟斤拷o)锟斤拷12,32锟斤拷锟斤拷f(θ)锟斤拷值;

锟斤拷锟斤拷(2) 锟斤拷锟絚(di锟斤拷n)P(x,y)锟斤拷平锟斤拷^(q锟斤拷)锟斤拷Ω锟斤拷x+y≥1,x≤1,y≤1锟斤拷 锟较碉拷一锟斤拷(g锟斤拷)锟斤拷(d锟斤拷ng)锟絚(di锟斤拷n)锟斤拷試锟絖锟斤拷锟斤拷θ锟斤拷取值锟斤拷锟斤拷锟斤拷锟斤拷锟襟函旓拷(sh锟斤拷)f(θ)锟斤拷锟斤拷小值锟斤拷锟斤拷锟街碉拷锟�

锟斤拷锟斤拷锟斤拷锟斤拷 锟斤拷(1)锟斤拷(w锟斤拷n)只锟斤拷要锟絓(y锟斤拷n)锟斤拷锟斤拷锟角猴拷锟斤拷(sh锟斤拷)锟侥讹拷锟絰锟斤拷锟斤拷;锟斤拷(2)锟斤拷(w锟斤拷n)锟斤拷只要锟饺�锟�(hu锟斤拷)锟斤拷平锟斤拷^(q锟斤拷)锟斤拷Ω锟斤拷锟劫革拷锟斤拷(j锟斤拷)锟介畫(hu锟斤拷)锟斤拷锟斤拷平锟斤拷^(q锟斤拷)锟斤拷_锟斤拷锟斤拷θ锟斤拷取值锟斤拷锟斤拷锟斤拷锟組(j锟斤拷n)锟斤拷锟紻(zhu锟斤拷n)锟斤拷锟斤拷锟斤拷f(θ)=a?sin?θ+b?cos?θ锟酵猴拷锟斤拷(sh锟斤拷)锟斤拷锟斤拷值锟斤拷

锟斤拷锟斤拷锟斤拷 (1) 锟斤拷锟絚(di锟斤拷n)P锟斤拷锟斤拷锟斤拷(bi锟斤拷o)锟斤拷锟斤拷锟角猴拷锟斤拷(sh锟斤拷)锟侥讹拷锟絰锟缴碉拷?sin?θ=32锟斤拷?cos?θ=12锟斤拷

锟斤拷锟斤拷锟斤拷锟斤拷f(θ)=3?sin?θ+??cos?θ=?3×32+12=2锟斤拷

锟斤拷锟斤拷(2) 锟斤拷锟斤拷平锟斤拷^(q锟斤拷)锟斤拷Ω (锟斤拷锟斤拷锟斤拷锟轿區(q锟斤拷)锟斤拷ABC)锟斤拷D锟斤拷示锟斤拷锟斤拷锟斤拷A(1,0)锟斤拷B(1,1)锟斤拷?C(0,1)?.锟斤拷锟斤拷0≤θ≤?π?2,

锟斤拷锟斤拷锟斤拷f(θ)=3?sin?θ+?cos?θ=2?sin?θ+?π?6锟斤拷

锟斤拷锟斤拷锟斤拷?π?6≤θ+??π?6≤?2?π?3锟斤拷

锟斤拷锟斤拷锟绞�锟�(d锟斤拷ng)θ+?π?6=?π?2锟斤拷锟斤拷θ=?π?3锟絩(sh锟斤拷)锟斤拷f(θ)取锟斤拷锟斤拷锟街�锟斤拷锟斤拷锟斤拷锟街碉拷锟斤拷锟�2;

锟斤拷锟斤拷锟斤拷(d锟斤拷ng)θ+?π?6=?π?6锟斤拷锟斤拷θ=0锟絩(sh锟斤拷)锟斤拷f(θ)取锟斤拷锟斤拷小值锟斤拷锟斤拷锟斤拷小值锟斤拷锟斤拷1锟斤拷

锟斤拷锟斤拷锟絚(di锟斤拷n)锟絬(p锟斤拷ng) 锟斤拷锟絵锟叫碉拷锟斤拷锟斤拷锟斤拷锟絚(di锟斤拷n)锟斤拷锟斤拷锟皆斤拷锟斤拷}锟斤拷锟斤拷式锟斤拷锟斤拷(xi锟斤拷n)锟斤拷規(gu锟斤拷)锟斤拷锟叫的伙拷锟紸(ch锟斤拷)锟斤拷(n锟斤拷i)锟斤拷平锟斤拷^(q锟斤拷)锟斤拷锟絚锟斤拷锟角猴拷锟斤拷(sh锟斤拷)锟斤拷锟斤拷值锟組(j锟斤拷n)锟斤拷锟剿碉拷锟叫機(j锟斤拷)锟紺锟斤拷锟斤拷锟絕(gu锟斤拷)去锟絭锟斤拷呖锟斤拷锟�(du锟斤拷)锟斤拷(xi锟斤拷n)锟斤拷規(gu锟斤拷)锟斤拷锟斤拷锟斤拷锟叫诧拷锟斤拷锟斤拷見(ji锟斤拷n)锟斤拷