阅读下面的古诗。
                                                                                                                                                  画眉鸟
                                                                                                                                                  欧阳修
                                                                                                                         百啭千声随意移，山花红紫树高低。
                                                                                                                         始知锁向金笼听，不及林间自在啼。

把函数y=sin(2x+$\frac{\mathrm{\pi }}{4}$)的图象向左平移$\frac{\mathrm{\pi }}{8}$个单位，再将横坐标缩小为原来的$\frac{1}{2}$，则其解析式为____ 

两条直线被第三条直线所截，∠1是∠2的同旁内角，∠3是∠2的内错角．若∠1=3∠2，∠2=3∠3，求∠1、∠2的度数．