化简sin(nπ+2π/3)*cos(nπ+4π/3)最好能详细点,这部分不太懂
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化简sin(nπ+2π/3)*cos(nπ+4π/3)最好能详细点,这部分不太懂
化简sin(nπ+2π/3)*cos(nπ+4π/3)
最好能详细点,这部分不太懂
化简sin(nπ+2π/3)*cos(nπ+4π/3)最好能详细点,这部分不太懂
sin(nπ 2/3π)*cos(nπ 4/3π)
=(sinnπcos2/3π cosnπsin2/3π)(cosnπcos4/3π-sinnπsin4/3π)
=(0 √3/2cosnπ)(-1/2cosnπ-0)
=-√3/4(cosnπ)²
=-√3/4
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