【单选题】使得函数 y=5cos(2x - )取得最大值的 x 值是 ( )
【单选题】She had not seen her father all ________, because he mostly worked on the ships.
【单选题】She had not seen her father all _________, because he most worked on the ships.
【简答题】已知函数 f(x)=sin x 2 cos x 2 + 1 2 sin(x+ π 2 ) . (1)写出f(x)的最小正周期以及单调区间; (2)若函数 h(x)=cos(x+ 5π 4 ) ,求函数y=log 2 (f(x)?h(x))的最大值,以及使其取得最大值的x的集合.
【单选题】函数 y = 5 - 2cos x 取最小值时的 x 集合是
C.
{ x | x = 2 k π, k ∈ Z }
D.
{ x | x =π+2 k π, k ∈ Z }
【简答题】Mary could not resist the temptation to whisper about what she had seen in her friend's ear.
【简答题】已知向量 a =(cosωx-sinωx,sinωx) , b =(-cosωx-sinωx,2 3 cosωx) ,其中ω>0,且函数 f(x)= a ? b +λ (λ为常数)的最小正周期为π. (Ⅰ)求函数y=f(x)的图象的对称轴; (Ⅱ)若函数y=f(x)的图象经过点 ( π 4 ,0) ,求函数y=f(x)在区间 [0, 5π 12 ] 上的取值范围.
【简答题】The washwoman was very old, as could be seen from the wrinkles in her face and the way she had to struggle to carry her big bundle of laundry. But 1 her aging body, her spirit was still strong. Year a...
【简答题】求函数y=-cos 2 x+ 3 cosx + 5 4 的最大值及最小值,并写出x取何值时函数有最大值和最小值.
【简答题】I had never seen her wearing colourful clothes. In fact, she really did not know how to ________________.