若角α,β,满足-π/2

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若角α,β,满足-π/2若角α,β,满足-π/2若角α,β,满足-π/2利用不等式同向可加.-π/2

若角α,β,满足-π/2
若角α,β,满足-π/2

若角α,β,满足-π/2
利用不等式同向可加.
-π/2

若角α,β,满足-π/2 若角α,β满足-π/2 若角α,β满足π/-2 若角α、β满足π/-2 若角α、β满足π/-2 若角α,β满足-π 若角a,β 满足 -π/2 若α,β 满足-π/2 设α,β满足条件-π/2 设α,β满足条件-π/2 若α,β满足π/2我刚刚发错了。其实是，若α,β满足-π/2 不等式 (24 20:6:15)若角α,β满足-π/2 若角A,B满足-π/2 若角A、B满足-π/2 若角A、B满足-π/2 若角a,b满足-π/2 若角a,b满足-π/2 若角A、B满足-π/2