sin3x+cos3x等于

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sin3x+cos3x等于sin3x+cos3x等于sin3x+cos3x等于sin3x+cos3x=√2(√2/2*sin3x+√2/2cos3x)=√2(sin3xcosπ/4+cos3xsinπ

sin3x+cos3x等于
sin3x+cos3x等于

sin3x+cos3x等于
sin3x+cos3x
=√2(√2/2*sin3x+√2/2cos3x)
=√2(sin3xcosπ/4+cos3xsinπ/4)
=√2sin(3x+π/4)