【正文】
ybBxAyxMOAOx標(biāo)為的坐點(diǎn)坐標(biāo)為的那么點(diǎn)標(biāo)為的坐點(diǎn)邊的角為為終為始邊設(shè)0?? ? ? ?? ?.s i n,c o s`,s i n,c o s,s i n,c o s,??????aaxAAbaOAbaACA????所以標(biāo)為的坐的參數(shù)方程得點(diǎn)由圓上在圓因?yàn)辄c(diǎn) 1從而所以因?yàn)?,`,` 0??? AAOAAAOA? ? ? ? .s i nc o sc o s 02 ??? ??? aaxaOABB` MA` xy?102 ?圖記解得 .c os ?ax ?.s e c,s e cc os ??? ax ?? 則1.tan,tan,`???bybyB??即三角函數(shù)定義有由的終邊上在角因?yàn)辄c(diǎn)的軌跡的參數(shù)方程為點(diǎn)所以 M,.t a n,s e c??