5√3sin(1080+60)+4cos(720+60)-ctg²30=5√3sin60+4cos60-ctg²30=
=5√3*√3/2+4*1/2-(√3)²=7,5+2-3=6,5
1)если прибавить 17 и 21, то получится 38; далее от 76 отнимаем 38 и получаем 38
2) со второй строчкой также - если прибавим 8 и 33 получим 41, и чтобы получить такое же число 41, надо его отнять от 82.
Ответ: 82
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