化简1−sin2160∘−−−−−−−−−−√1−sin2160∘的结果是( )。单项选择题选项:
A.cos160∘cos160∘ B.−cos160∘−cos160∘ C.±cos160∘±cos160∘ D.±|cos160∘|±|cos160∘|正确答案B
化简1−sin2160∘−−−−−−−−−−√1−sin2160∘的结果是( )。单项选择题选项:
A.cos160∘cos160∘ B.−cos160∘−cos160∘ C.±cos160∘±cos160∘ D.±|cos160∘|±|cos160∘|正确答案B