突然發現原來今年core 條polynomial同1617果份學友社mock問法都幾相似
係喎唔明點解要subsidiary angle formula答案係pi/2
bi個答案唔係就係∠AOB同埋180°-∠AOB嗎
用返a就搞掂
唔係aob 因為oa=/=ob
b個點轉∠AOB rad 係 o a b’ collinear 唔係 a b b’
但係我唔明點解subsidary angle formula會爆左一隻爛既角出黎 唔係應該sub返sqrt(x^2+y^2)=sqrt26就做到?
我之前諗咗第二樣嘢
唔介意嘅俾你個step嚟睇下