Question

（2009•徐州模擬）計(jì)算：．

Answer 1

【答案】分析：根據(jù)特殊角的三角函數(shù)值，非0實(shí)數(shù)的0次冪及非0實(shí)數(shù)的負(fù)整數(shù)次冪和數(shù)的開方計(jì)算．
解答：解：原式=2+-1-6×
=2+3-1-3
=2-．
點(diǎn)評(píng)：本題考查特殊角三角函數(shù)值的計(jì)算，sin60°=；非0實(shí)數(shù)的0次冪等于1；非0實(shí)數(shù)的負(fù)整數(shù)次冪等于實(shí)數(shù)整數(shù)次冪的倒數(shù)．