#1
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trigonometryyy
àÍÍ ªèÇÂá¡éÊÁ¡ÒÃËÒ૵¤ÓµÍºãËé´Ù·Õ¤ÃѺ $ (sin x + \sqrt{3} cos x )(sin 4x) = 2 $ ¼Áá¡éÁÑèÇæ ä´é {x/x = 96ð ËÃ×Í x = 24ð}¤ÃѺ - - áµèà©ÅÂÇèҤӵͺà»ç¹à«µÇèÒ§ -*- §§ ªèÇÂáÊ´§ÇÔ¸Õ·ÓãËé´Ù·Õ¤ÃѺ ¢Íº¤Ø³¤ÃѺ
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#2
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¨Ñ´ãËéà»ç¹ÃٻẺ¹Õé«Ô¤ÃѺÍÒ¨ªèÇÂãËéËÒ§§ä´é
$\frac{1}{2} (sin x + \sqrt{3} cos x )(sin 4x) = 1$ ¶éÒÂѧÁͧäÁèÍÍ¡¡ç¤èÍ´ٺÃ÷ѴÅèÒ§¤ÃѺ $ (\frac{1}{2}sin x + \frac{\sqrt{3}}{2} cos x )(sin 4x) = 1$ $\sin (A+B) = \sin A \cos B+\cos A \sin B$ |
#3
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ãªè¨Ñ´ÃÙ»áÅéÇÊØ´·éÒÂà»ç¹
sin (60 + x) sin 4x = 1 ÃÖ»èÒǤÃѺ áÅéǨѺ sin (60 +x) = sin 90 áÅÐ sin 4x = 90 á¡éÃкºÊÁ¡ÒÃä´é x = 24 ͧÈÒ áÅéÇ¡ç sin (60 + x ) = sin 270 áÅÐ sin 4x = 270 á¡éÃкºÊÁ¡ÒÃä´é x = 96 ͧÈÒ ¼Á·ÓÁÒ§ÕéáËÅФÃѺ áµèà¤éÒà©ÅÂÇèҵͺ૵ÇèÒ§ÍèФÃѺ ¡çàÅ §§ ÇèÒ·ÓäÁ 24 ¡Ñº 96 ãªéäÁèä´é äÁèà¢éÒéã¨ÍèФÃѺ ¡çàŤԴÇèÒ¼Áá¡éÊÁ¡ÒüԴàͧ µÃ§·Õè ¨Ñº sin (60 +x ) áÅÐ sin 4x = 1 ËÃ×Í -1 ÍèФÃѺ ¶éÒÁÕÇÔ¸Õá¡é ËÃ×ÍÃÙéÇèÒ¼Ô´µÃ§ä˹ªèǺ͡·Õ¤ÃѺººº
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#4
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àÍÍ ÁÕ⨷Â×ãËÁèÁÒ¶ÒÁà¾ÔèÁ¤ÃѺ
1.ãËé g(x) = $ \frac{1}{x-3} $ ¨§ËÒ Range ¢Í§ g(x) ¼Á¤Ô´ä´é Range = R - {0} áµèà¤éÒà©Å Range ¢Í§ g(x) = R - {3} §§¤ÃѺ ¤Ô´¼Ô´µÃ§ä˹ËÇèÒ ? 2. ¡Ó˹´ (1) $(\frac{a}{a+1})^{\sqrt{2}} < (\frac{a}{a+1})^{\sqrt{3}}$ (2)$(\sqrt{2} )^{\frac{a}{a+1} } < (\sqrt{3} )^{\frac{a}{a+1} } $ (3)$log_\sqrt{2}\frac{a}{a+1} < log_\sqrt{3}\frac{a}{a+1}$ (4)$log_{\frac{a}{a+1} }\sqrt{2} < log_{\frac{a}{a+1} }\sqrt{3}$ â´Â·Õè a > 0 áÅéÇ¢éͤÇÒÁ (1) - (4) ¢éÍã´¶Ù¡µéͧ ¼Áä´é ¢éÍ (1) ¡Ñº (2) ¶Ù¡ áµèà©Åº͡ ¢éÍ (2) ¡Ñº (3) ¶Ù¡ ªèǺ͡·Õ¤ÃѺÇèÒ¼Ô´µÃ§ä˹ ? ¢Íº¤Ø³ÁÒ¡æ¤ÃѺ
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àÃ×èÍÂæ à©×èÍÂæ |
#5
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¢éÍ 1 Range = R - {0}
¹èҨж١áÅéǹФÃѺ Êèǹ R - {3} à»ç¹ â´àÁ¹ ¢éÍ 2 ¢éÍ (1) ¹èҨмԴ¹Ð¤ÃѺ à¾ÃÒÐÁѹà»ç¹ ¿Ñ§¡ìªÑ¹Å´ ¤ÃѺ
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My stAtUs ·ÓäÁÂÔè§àÃÕ¹ áÅéÇÂÔè§â§èËÇèÒÒ |
#6
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ÍéÒ§ÍÔ§:
àÃÒÃÙéÇèÒ $-1\leqslant \sin \theta \leqslant 1$ ¶éÒ¨ÐãËéà»ç¹ä»µÒÁà§×è×è͹䢷Õè⨷Âì¡Ó˹´áÊ´§ÇèҨеéͧãËé $\sin (60 + x) = 1$ áÅÐ $\sin 4x = 1$ ËÃ×Í $\sin (60 + x) = -1$ áÅÐ $\sin 4x = -1$ «Ö觷Ñé§Êͧ¡Ã³Õ äÁèÊÒÁÒöËÒ¤èÒ x ·Õè·ÓãËé¤èҢͧ䫹ì´Ñ§¡ÅèÒÇà·èҡѺ 1 ËÃ×Í-1 ¾ÃéÍÁ¡Ñ¹ ´Ñ§¹Ñ鹤ӵͺ¤×Í૵ÇèÒ§ |
#7
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¢Íº¤Ø³ÁÒ¡æ¤ÃѺ à·¾¨ÃÔ§æ
¾Í¨Ðà¢éÒ㨢Öé¹ÁÒºéÒ§¤ÃѺ àÍÍ §§ ¹Ô´Ë¹è͵ç·ÕèÇèÒ¢é͵ÃÕ⡳ÍèФÃѺ "«Ö觷Ñé§Êͧ¡Ã³Õ äÁèÊÒÁÒöËÒ¤èÒ x ·Õè·ÓãËé¤èҢͧ䫹ì´Ñ§¡ÅèÒÇà·èҡѺ 1 ËÃ×Í-1 ¾ÃéÍÁ¡Ñ¹ ´Ñ§¹Ñ鹤ӵͺ¤×Í૵ÇèÒ§" ¤×Í µéͧàÍҤӵͺÁÒ intersect ¡Ñ¹´éÇÂËÃͤÃѺ ¾ÍËҤӵͺàÊÃé¨áéÅéÇ ?
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#8
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ÍéÒ§ÍÔ§:
Åͧ¡Ñºä»´Ù¢éͤÇÒÁ·Õèâ¾ÊµìÍÕ¡·Õ¡çä´é¤ÃѺ |
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