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roman44
@roman44
July 2022
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Решить тригонометрическое уравнение: 2√2-2√4*sin^2(9п/8)
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Zhiraffe
2√2-4√2*sin^2(9п/8)
=2√2*(1-2*sin^2(9п/8))=
2√2*cos(2*9п/8)=
2√2*cos(9п/4)=
=
2√2*cos(2п+
п/4)=
=2√2*cos(п/4)=2√2*√2/2=2
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Answers & Comments
=2√2*cos(2п+п/4)==2√2*cos(п/4)=2√2*√2/2=2