[DSE 2019] 你地溫 數學 又溫成點呢？ [7]

sor 我指sub pi/2 個啲
btw 到時如果真係諗唔到 可能會出動asinx+bcosx 條式

正路應該係諗 t sub

想問下18b用pyth theorem prove佢唔等於90得唔得

(b) 個個 睇bprp有做過
咁subsidary angle formula其實做唔做到

最好嘅方法係自己試下

Sure
2013問過類似嘅嘢
marking有哂兩個方法

pure maths p1 除左system of linear equation
仲有咩topic係做到

Matrix

好多都考埋transformation個啲

vector ?

幫佢答埋
好多都考埋linearly independent嗰啲

ii 1 點做

tan(theta) = |(m1 - m2)/(1+m1m2)|

呢個依家當唔當係基本知識要識

absolute value 都 out-c
你話呢

之後個啲係咪做唔到落去

應該做到㗎
btw M2好似根本就無co-goem

用 tan x1 = slope of L1, tan x2= slope of L2 去諗 ?
tan theta = tan(x1+x2)

其實pure math果d conic section(?) 係咪改反做parabola, circle .core都大概可以做下

https://www.mathstopia.net/coordinate-geometry/angle-two-lines
喺google求其search到

但係M2根本都無co-goem
頂多係搵tangent/normal叫做關事

都係.但睇反呢年份core出成咁,eaa係咪都會起pure改頭換面咁令出黎做大佬題

乜M2有大佬題㗎咩