f(x)=1+x+cosx在[-3π/2,π/2]上是：A.单增函数B.单减函数c.在[-3π/2,-π/2]上递增,在[-π/2,π/2]上递减D.在[-3π/2,-π/2]上递减,在[-π/2,π/2]上递增

Question

f(x)=1+x+cosx在[-3π/2,π/2]上是：
A.单增函数 B.单减函数 c.在[-3π/2,-π/2]上递增,在[-π/2,π/2]上递减 D.在[-3π/2,-π/2]上递减,在[-π/2,π/2]上递增

Answer 1

求个导数就可以啊~