(8sin^4 3п/20 - 8 cos^4 3п20) / sin 4п/5
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17.05.2019 13:00
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2
8(sin^2 (3pi/20)+cos^2 (3pi/20))(sin^2 (3pi/20)-cos^2 (3pi/20))
=
sin 4pi/5
-8cos(2*3pi/20) 8cos 3pi/10
= - = -8
sin(pi/2+3pi/10) cos 3pi/10