>
数学
>
函数y=2sinx+
2
cos(x+
π
4
)的最大值为( )
A.
6
B.
2
C. 2+
2
D.
10
人气:227 ℃ 时间:2019-11-24 01:50:09
解答
由题意得,y=2sinx+
2
cos(x+
π
4
)
=2sinx+
2
(cosxcos
π
4
-sinxsin
π
4
)
=2sinx+cosx-sinx=sinx+cosx=
2
sin(x+
π
4
)
当
sin(x+
π
4
)
=1时,函数y取到最大值是
2
,
故选:B.
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