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2cos(3x+π/4)-根号2=0
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2cos(3x+π/4)-根号2=0
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答案和解析
cos(3x+π/4)=√2/2
所以3x+π/4=2kπ±π/4
3x=2kπ-π/2.3x=2kπ
x=2kπ/3-π/6,x=2kπ/3
所以3x+π/4=2kπ±π/4
3x=2kπ-π/2.3x=2kπ
x=2kπ/3-π/6,x=2kπ/3
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