What is the sinA if A is in standard position and (2,-7) is on its terminal side 这段话什麼意思

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What is the sinA if A is in standard position and (2,-7) is on its terminal side 这段话什麼意思

如果A的终边在坐标轴的坐标(2.-7)上,则 sinA是多少
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如果A在原点,(2,-7)在角A的终边,求sinA。sinA=-7/2