решить. 2cos(2x + π/4) = – √2; - вопрос №224215739116 от Polina011020040 01.06.2021 09:35

Question

Математика: решить. 2cos(2x + π/4) = – √2;

Polina011020040 · Answer

2cos(2x + π/4) = – √22(cos2x cosπ/4 -sin2x sinπ/4 ))-√22(cos2x*√2/2 - sin2x*√2/2)-√22(√2cos2x/2 - √2sin2x/2)-√22*√2cos2x - √2sin2x/2 - √2√2cos2x - √2sin2x - √2ответ: √2cos2x - √2sin2x - √2...