помогите с заданием по алгебре!
задание на синусы и косинусы
...=sin^4(345')-cos^4(195')=sin^4(15')-cos^4(15')=sin^2(15')-cos^2(15')=-cos30'=-(sqrt3)/2
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...=sin^4(345')-cos^4(195')=sin^4(15')-cos^4(15')=sin^2(15')-cos^2(15')=-cos30'=-(sqrt3)/2