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mymail3
@mymail3
July 2022
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Вычислить 16cos20*cos40*cos80*sin20
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kirichekov
Verified answer
16*cos20°*cos40°*cos80°*sin20°
=
=8*(2*sin20°*cos20°)*cos40°*cos80°=8*sin(2*20°)*cos40°*cos80°=
=4*(2*sin40°*cos40°)*cos80°=4sin80°*cos80°=2*(2sin80°*cos80°)=
2*sin160°
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Verified answer
16*cos20°*cos40°*cos80°*sin20°==8*(2*sin20°*cos20°)*cos40°*cos80°=8*sin(2*20°)*cos40°*cos80°=
=4*(2*sin40°*cos40°)*cos80°=4sin80°*cos80°=2*(2sin80°*cos80°)=2*sin160°