|
ÊÁѤÃÊÁÒªÔ¡ | ¤ÙèÁ×Í¡ÒÃãªé | ÃÒª×èÍÊÁÒªÔ¡ | »¯Ô·Ô¹ | ¢éͤÇÒÁÇѹ¹Õé | ¤é¹ËÒ |
|
à¤Ã×èͧÁ×ͧ͢ËÑÇ¢éÍ | ¤é¹ËÒã¹ËÑÇ¢é͹Õé |
#1
|
|||
|
|||
ªèÇ·դÃѺµÃÕ⡳
1.૵¤ÓµÍºÁØÁ¢Í§ÊÁ¡Òà $\frac{cos\theta-sin\theta}{cos2\theta}=1$ àÁ×èÍ 0 $\leqslant$ $\theta$ $\leqslant$ $2\pi $
2.$(tan70-tan50+tan10)^2$ à·èҡѺà·èÒäËÃè |
#2
|
||||
|
||||
ÍéÒ§ÍÔ§:
$\cos\theta-\sin\theta=cos2\theta=\cos^2 \theta-\sin^2 \theta$ $(\cos\theta-\sin\theta)(\cos\theta+\sin\theta-1)=0$ ¨Ðä´éÇèÒ $(\cos\theta-\sin\theta)=0$ ËÃ×Í $(\cos\theta+\sin\theta-1)=0$ $\cos\theta=\sin\theta$ àÁ×èÍ $\theta=\frac{\pi}{4} ,\frac{5\pi}{4}$ «Ö觶éÒ $(\cos\theta-\sin\theta)=0$ ·ÓãËéÊÁ¡ÒÃäÁèà»ç¹¨ÃÔ§ $\cos\theta+\sin\theta=1$ $(\cos\theta+\sin\theta)^2=1$ $1+\sin2\theta=1 \rightarrow \sin2\theta=0$ â´Â·Õè $0 \leqslant 2\theta \leqslant 4\pi $ $2\theta=0,\pi,2\pi,3\pi,4\pi$ $\theta=0,\frac{\pi}{2},\pi,\frac{3\pi}{2} ,2\pi$ $\theta \in \left\{\,0,\frac{\pi}{2},\pi,\frac{3\pi}{2} ,2\pi\right\} $
__________________
"¶éÒàÃÒÅéÁºèÍÂæ ã¹·ÕèÊØ´àÃÒ¨ÐÃÙéÇèÒ¶éÒ¨ÐÅéÁ ÅéÁ·èÒä˹¨Ðà¨çº¹éÍ·ÕèÊØ´ áÅÐÃÙéÍÕ¡ÇèÒµèÍä»·ÓÂѧ䧨ÐäÁèãËéÅéÁÍÕ¡ ´Ñ§¹Ñ鹨§ÍÂèÒ¡ÅÑÇ·Õè¨ÐÅéÁ"...ÍÒ¨ÒÃÂìÍӹǠ¢¹Ñ¹ä·Â ¤ÃÑé§áá㹪ÕÇÔµ·ÕèÊͺ¤³ÔµÊÁÒ¤Á¤³ÔµÈÒʵÃìàÁ×èÍ»Õ2533...¼Áä´éá¤è24¤Ðá¹¹(¨Ò¡ÃéͤÐá¹¹) |
#3
|
||||
|
||||
¢éÍÊͧ àË繤¹à¾Ô觶ÒÁä»ã¹à¾¨¤³ÔµÁ.»ÅÒ µÍº 3
¼ÁṺÃÙ»ãËé´Ù¤ÃѺ ᤻ÁÒ¨Ò¡àǻ˹Ö觵èÒ§»ÃÐà·È
__________________
"¶éÒàÃÒÅéÁºèÍÂæ ã¹·ÕèÊØ´àÃÒ¨ÐÃÙéÇèÒ¶éÒ¨ÐÅéÁ ÅéÁ·èÒä˹¨Ðà¨çº¹éÍ·ÕèÊØ´ áÅÐÃÙéÍÕ¡ÇèÒµèÍä»·ÓÂѧ䧨ÐäÁèãËéÅéÁÍÕ¡ ´Ñ§¹Ñ鹨§ÍÂèÒ¡ÅÑÇ·Õè¨ÐÅéÁ"...ÍÒ¨ÒÃÂìÍӹǠ¢¹Ñ¹ä·Â ¤ÃÑé§áá㹪ÕÇÔµ·ÕèÊͺ¤³ÔµÊÁÒ¤Á¤³ÔµÈÒʵÃìàÁ×èÍ»Õ2533...¼Áä´éá¤è24¤Ðá¹¹(¨Ò¡ÃéͤÐá¹¹) |
#4
|
|||
|
|||
¢Íº¤Ø³¤Ø³¡ÔµµÔÁÒ¡æ¤ÃѺ ^^
|
#5
|
||||
|
||||
Å×Áàªç¤¡ÅѺàÃ×èͧÁØÁ·Õèãªéä´é ¤ÓµÍº¢Í§¤Ø³á¿Ãì¶Ù¡µéͧ¤ÃѺ ¼ÁÅ×Áàªç¤
__________________
"¶éÒàÃÒÅéÁºèÍÂæ ã¹·ÕèÊØ´àÃÒ¨ÐÃÙéÇèÒ¶éÒ¨ÐÅéÁ ÅéÁ·èÒä˹¨Ðà¨çº¹éÍ·ÕèÊØ´ áÅÐÃÙéÍÕ¡ÇèÒµèÍä»·ÓÂѧ䧨ÐäÁèãËéÅéÁÍÕ¡ ´Ñ§¹Ñ鹨§ÍÂèÒ¡ÅÑÇ·Õè¨ÐÅéÁ"...ÍÒ¨ÒÃÂìÍӹǠ¢¹Ñ¹ä·Â ¤ÃÑé§áá㹪ÕÇÔµ·ÕèÊͺ¤³ÔµÊÁÒ¤Á¤³ÔµÈÒʵÃìàÁ×èÍ»Õ2533...¼Áä´éá¤è24¤Ðá¹¹(¨Ò¡ÃéͤÐá¹¹) |
|
|