将y=2cos(x3+π6)的图象按向量a=(-π4,-2)平移,则平移后所得图

题型:选择题

问题:

y=2cos(
x
3
+
π
6
)
的图象按向量a=(-
π
4
,-2)
平移,则平移后所得图象的解析式为(  )
A.y=2cos(
x
3
+
π
4
)-2
B.y=2cos(
x
3
-
π
4
)+2
C.y=2cos(
x
3
-
π
12
)-2
D.y=2cos(
x
3
+
π
12
)+2
考点:函数y=Asin(wx+φ)的图象与性质
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