Mathematics
Senior High
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お願いします。
解説お願いします。
2
練27
mos 接点P(P.9)とおく
点は円上の点なので+4=1-①
点Pにおける接線の式はPx+4y=1-②
接線は点Aを通るから2P+9=1②
9=1-2P-③
③を①に代入してP2+(1-2P)^²=1
P*+1-4P²+48=1
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