Mathematics
Senior High
cosxcos5x-sinxsin5xがcos6xになるのがわかりません
② アニ5sin**・(sin *Y・cos5*十sin?*・(一Sin 5*)・(5*)
=5sin*x(cosヶ)cos5*十Sin"*(一sin5)・5
ー5sin*x(cos COS5ァー sinタSin 5 )
ー5sin* cos6*
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