✔ 最佳答案
要視乎你的計數機型號,不同的按法有所不同。
首先整理好你那個方程:
1.33 = (sin40)/sinθ
sinθ = (sin40)/1.33
θ=sin-1((sin40)/1.33)
若果計數機是Casio fx-50F/ fx-3600PV/ fx-3800P / fx-3900PV,按法如下:
注意要在DEG Mode,若果不是, 按 [MODE] [4]
[4] [0] [sin] [÷] [1] [.] [3] [3] [=] [SHIFT] [sin]
這時會顯示答案為 28.90108454
若果計數機是Casio fx-3650P / fx-3950P
注意要在DEG MODE,若果不是, 按 [MODE] [MODE] [MODE] [MODE] [1]
[SHIFT] [sin] [(] [sin] [4] [0] [÷] [1] [.] [3] [3] [EXE]
這時會顯示答案為 28.90108454