
cos(150°-2π) =cos【-(2π-150°)】 =cos(2π-150°) =cos150° =

若tanα=3,则sinαcosα的值等于

cos 2

急:求sin390° cos(-150°)tan210°的值

若msinθ cosθ的最小值为-√2,则实数m的值可能是
cos(150°-2π) =cos【-(2π-150°)】 =cos(2π-150°) =cos150° =
若tanα=3,则sinαcosα的值等于
cos 2
急:求sin390° cos(-150°)tan210°的值
若msinθ cosθ的最小值为-√2,则实数m的值可能是