请问 2log secα cos(2π-α)的值是多少?
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![请问 2log secα cos(2π-α)的值是多少?](/uploads/image/z/7963341-69-1.jpg?t=%E8%AF%B7%E9%97%AE+%EF%BC%92log+sec%CE%B1+cos%282%CF%80-%CE%B1%29%E7%9A%84%E5%80%BC%E6%98%AF%E5%A4%9A%E5%B0%91%3F)
请问 2log secα cos(2π-α)的值是多少?
请问 2log secα cos(2π-α)的值是多少?
请问 2log secα cos(2π-α)的值是多少?
2log secα cos(2π-α)
=2log secα cosα ------------------------------cos(2π-α) = cosα
=2log1 ------------------------------正割和余弦互为倒数
=0 ------------------------------log1 = 0