①当x为第一象限角时,y=
| sinx |
| sinx |
| cosx |
| cosx |
| tanx |
| tanx |
| cotx |
| cotx |
②当x为第二象限角时,y=
| sinx |
| sinx |
| cosx |
| cosx |
| tanx |
| tanx |
| cotx |
| cotx |
③当x为第三象限角时,y=-
| sinx |
| sinx |
| cosx |
| cosx |
| tanx |
| tanx |
| cotx |
| cotx |
④当x为第一象限角时,y=-
| sinx |
| sinx |
| cosx |
| cosx |
| tanx |
| tanx |
| cotx |
| cotx |
∴函数y=
| sinx |
| |sinx| |
| |cosx| |
| cosx |
| tanx |
| |tanx| |
| |cotx| |
| cotx |
故选B.
