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05.02.2021 •
Mathematics
Kelsker wanted to find the of in equation - x ^ 2 - 48 = 0 Dennis her that the answers can be written in the form of x = plus/minus 4 * i * sqrt(a) wiere a represents a wole numbe Enter the value of a
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Ответ:
1. rule: cosα=sin(90°-α), it means that cos 3x=sin(90°-3x);
2. sin(90°-3x)=sin(x+18°); ⇔ 90°-3x=18°+x; ⇔ x=18°.
x=18°.