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#2
15 ¾ÄÉÀÒ¤Á 2015, 20:24
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$sin(x)+sin(3x) + 4(sin(3x)+sin(5x)) $
$= 2sin(2x)cos(x)+8sin(4x)cos(x)$ $= 2cos(x)[sin(2x)+4sin(4x)]$ µÍº $2cos(x)$
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Hope is what makes us strong. It's why we are here. It is what we fight with when all else is lost. 15 ¾ÄÉÀÒ¤Á 2015 20:26 : ¢éͤÇÒÁ¹Õé¶Ù¡á¡éä¢áÅéÇ 4 ¤ÃÑé§, ¤ÃÑé§ÅèÒÊØ´â´Â¤Ø³ FranceZii Siriseth 
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