试题详情
已知
![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAKgAAAAjCAYAAAAAPEGvAAAAAXNSR0IArs4c6QAAAARnQU1BAACx
jwv8YQUAAAAJcEhZcwAADsMAAA7DAcdvqGQAAAOxSURBVHhe7ZuNsawgDIWtzJ5sx2a2FEvxEghs
hERAQdk7+WaYefgLh0MI7n3TrigDowZVhkYNqgyNGvQq27rP07RPUJYPHlRq2NbZ6QdlXvcNj1PU
oJf47EsQ1PzbCKwerYVqKKMGvcK2HYT9LGrQaj5LkWZq0LsYoXWJr2Xb1xmX9mkxsVRGDXoDiJya
g97DaTjvq7DWq0HvgpulWVJYyWI3S8IkV4M2wApckPArEvKGSQ3aAs1Db2IM+noE7TaINOE2JZqJ
n0XOb9rg3v+cP9376lKKc43e5myMnjEomLOLKCh8cEdcBzoYCPrjB9uU58wJ1Bq0RKOHoT9yZPTr
b1BoTLcZy3wkZycDXMfPUmq0XPlNSjUaU4vub+r7ETsVHzYsbHTplmKMToVGA4IGxbDvZ0gykPR8
GonC90Bb6IdXEEf4EEvCvBXL1s8/2qZ48Un7JBNeev57iJqibqGboS5pUKHRgBiDuoaHNtv86mhC
EMvPOPcDfyQY6fC2rt9zwlLiRfPPhCR5MYVeexygqHwby0YH/p1RP0dG0hTNCBrY06Qexsweo+NX
o9E1ysbqGpNsIkTocFgivEhMQ0QhkkkQPbOYVHzfnrQ5zqDxO1hRheLhzvnShBNN0z5z9XODShpx
/ZFKDdz9JcXem51NiZmYgfaCQiG9PjcoXW6vRjdGfDyWmp036BNQwYsRNE37XFsHJI3Gw0XQs9ws
mW0nZsJrQ8el6Byb3t5HJ0EpjPhJez1XJ8F9LhnUE2uaNWCubhA1Gg+jmuvAYZaaDqyh6gY2GM12
7piDfq+FKt0hwrM547l3+utsDjOb68xztnWpMGradvcsbkWAa08mYmeqDJrVtN6gZRqNB6qGnfAl
aTw9HxkOZ2O4lwgBgBjRIcfhPjAOTgT2YgkcjAUiMj5LEh6idtWz89gUJvdeA5yvQtQUNbLHYRzi
OjdOFRr1xvYr8g9A+xuN0cV1pwL78l6RC8RnOpwAA1lyXQ3m3QUDDaK/S6lGnbFpHZ04HqojTiZi
lmfUk3LR25SI76JM4+Bp+9T8mV0YxKAWpi2Z/53w3PSGSNp6RAuis5hi3IIure/ltUV0XcFqyUwW
Jg17e/35eeyGY5gINTqyQZ2OpqhB22M3S+3D9D8kE0Fxs/T9YqEGbYQR/q2d8U+RMagh/nFHDdoE
I7xG0ALyBo3zUDVoA/r/1f5/IWfQ9IuLGvQKmCu5XXyPrwT/EEmz8H2U11INqgyNGlQZGjWoMjRq
UGVg9v0PXK8N3RKbLCkAAAAASUVORK5CYII=
)
,且
![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAJwAAAAjCAYAAABhJGPtAAAAAXNSR0IArs4c6QAAAARnQU1BAACx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)
,则sinα=________.
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