[DSE 2021] 大家準備好瘋狂做 數學 未呢？ [5]
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a+(n-1)d
有咩唔識?
Part e
180度減返angle between plane ACP and ACD
原來係咁，我本身hardcore地直接搵，計勁耐
有個位唔係好明 angle between two planes
definition上唔係唔會大過90度咩
definition上唔係唔會大過90度咩
plane理論上係可以infinitely extended
所以計個angle between two planes會拎細過90度嗰隻
但題目指明要angle between plane ACP and ACB
我諗佢用意係表明而家consider a finite region of a plane
正如angle ABC唔一定等於angle between AB and BC
https://en.m.wikipedia.org/wiki/Dihedral_angle
The absolute value is required in above formulas, as the planes are not changed when changing all coefficient signs in one equation, or replacing one normal vector by its opposite.
However the absolute values can be and should be avoided when considering the dihedral angle of two half planes whose boundaries are the same line.
所以計個angle between two planes會拎細過90度嗰隻
但題目指明要angle between plane ACP and ACB
我諗佢用意係表明而家consider a finite region of a plane
正如angle ABC唔一定等於angle between AB and BC
https://en.m.wikipedia.org/wiki/Dihedral_angle
The absolute value is required in above formulas, as the planes are not changed when changing all coefficient signs in one equation, or replacing one normal vector by its opposite.
However the absolute values can be and should be avoided when considering the dihedral angle of two half planes whose boundaries are the same line.
不停操past paper一定有4，但5**無咩可能，因為你只係識操past paper。成班M1同M2去考，D野識就係人都識，問題係穩定輸出同保証無錯方面，唔係話做一萬條就乜都知。
等於努力會令你做到中層管理，但再努力D唔會令你做老板。努力的人最啱打工。
等於努力會令你做到中層管理，但再努力D唔會令你做老板。努力的人最啱打工。
我果屈45/45都係5*
On撚柒鳩😭
On撚柒鳩😭