问题
选择题
|
答案
∵(x+sinx)′=1+cosx,
∴
(1+cosx)dx=(x+sinx)|∫
-π 2 π 2
-π 2 π 2
=
+sinπ 2
-[-π 2
+sin(-π 2
)]=π+2.π 2
故选D
|
∵(x+sinx)′=1+cosx,
∴
(1+cosx)dx=(x+sinx)|∫
-π 2 π 2
-π 2 π 2
=
+sinπ 2
-[-π 2
+sin(-π 2
)]=π+2.π 2
故选D