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Un article trouvé pour ce sujet.
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cos(2x) = sin(3x) |
2005-04-14 |
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A student pose la question :
Show that if x= 18 degrees, then cos2x =sin 3x. HENCE find the exact value of sin 18 degrees, and prove that cos 36 - sin 18 =1/2.
Andrei Volodin, Claude Tardif and Penny Nom lui répond. |
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