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ArtyomO
@ArtyomO
August 2021
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Тригонометрия, 10 класс.
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harutyunyan46
8*cos20*cos40*cos80 -sin10= 4*2sin20cos20*cos40*cos80/sin20 -sin10= 2*2sin40cos40*cos80/sin20-sin10= 2*sin80*cos80 /sin20 -sin10= sin160/sin20-sin10 =sin(180-20)/sin20 -sin10 = sin20/sin20-sin10 =1-sin10= 1-cos80 = 2*(1-cos80)/2 =2*cos40^2.
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