第二问怎么做~
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2、
(3) -π/2=<x<=π/2
-π=<2x<=π
-5π/6=<2x+π/6<=7π/6
单调递减：-5π/6=<2x+π/6<=-π/2和π/2=<2x+π/6<=7π/6
-π/2=<x<=-π/3和π/6=<x<=π/2
单调递减区间：[-π/2,-π/3]U[π/6,π/2]
单调递增区间：[-π/3,π/6]
(3) -π/2=<x<=π/2
-π=<2x<=π
-5π/6=<2x+π/6<=7π/6
单调递减：-5π/6=<2x+π/6<=-π/2和π/2=<2x+π/6<=7π/6
-π/2=<x<=-π/3和π/6=<x<=π/2
单调递减区间：[-π/2,-π/3]U[π/6,π/2]
单调递增区间：[-π/3,π/6]
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