Ответы и объяснения

2013-03-25T09:24:19+00:00
2013-03-25T09:30:02+00:00

1 < sinx<1                                                                                                                                                          3<3 sinx<3                                                                                                                                                         3-1<3sinx-1<3-1                                                                                                                                              4<3 sinx<2