(2)由y=sin(2x-)知
x
0
∴函数y=f(x)的单调增区间为[kπ+,kπ+],∈Z.
由题意，得2kπ-≤2x-≤2kπ+,k∈Z.
=-sin2x-cos2x=sin(2x-
=-sin2x-?
19.（1）∵f(x)=-sinxcosx-cos2x+
13.x+2y-4=0 14. 15.35 16.2 17.-8 18.1≤k≤
)知
∴函数y=f(x)的单调增区间为[kπ+
≤2x-
sin2x-
?
15.35 16.2 17.-8 18.1≤k≤