无
*注意事项:
1
2
3
且 , 则; .
(Ⅰ)的最小正周期;
(Ⅱ)的单调递增区间.
(Ⅰ)求证:平面;
(Ⅱ)求直线与平面所成角的正弦值.
A : 48.1,49.2,51.2,52.7,53.3,54.2,55.3,56.4,57.6,60.6;
B :48.9,50.1,51.5,52.5,52.6,53.4,54.9,55.6,56.7,58.7;
(Ⅰ)求椭圆的方程;
(Ⅱ) 若过的直线与轴交于点 , 过点作直线 , 不垂直于坐标轴且与不重合,与椭圆交于 , 两点,直线 , 分别交直线于 , 两点,求证: .
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