1,对称轴方程x=kπ+2π/3,k∈Z,和单调增区间[2kπ-π/3,2kπ+2π/3],
单调减区间[2kπ+2π/3,2kπ+5π/3],其中k∈Z.
2,在-π/2<α+β<π/2的三式上分别乘以5/2
在-π/6<α-β<π 的三式上分别乘以1/2,二式对应相加即可得
-4π/3<3α+2β<7π/4,
1,对称轴方程x=kπ+2π/3,k∈Z,和单调增区间[2kπ-π/3,2kπ+2π/3],
单调减区间[2kπ+2π/3,2kπ+5π/3],其中k∈Z.
2,在-π/2<α+β<π/2的三式上分别乘以5/2
在-π/6<α-β<π 的三式上分别乘以1/2,二式对应相加即可得
-4π/3<3α+2β<7π/4,