33) Find the general solution of the equation cos2AsinA+sin2A=sin3Afinished
上面果條應該好淺...但係居然諗唔到
lovejenas
2007-09-03 17:30
amath-0-"
樂仔
2007-09-03 17:34
引用第1樓lovejenas於2007-09-03 17:30發表的“”: amath-0-"
第一條應該唔算..冇讀a.maths都會識做..好淺真係
lovejenas
2007-09-03 17:46
第一條好似expand佢就搞掂- -
第2條我已經唔記得左咩叫general solution = ="
應該有人識的- -
等下啦-0-
豬脾
2007-09-03 17:57
第一題應該都係考binomial.. 33. 用product of compound angle 個條 0.5(sin3A-sinA)+sin2A-sin3A=0 2sin2A-sin3A-sinA=0 再用sum of compound angle 個個東東 2sin2A(1-cosA)=0 sin2A=0 or cosA=1 2A=180n 360n a=90on where n is an interger 可能錯既//