Question

Film out

誰可以說明圈起來為何是那樣，只有一個sita,怎麼會知道是sec-1x/2

4 4.
Etib tx to
=&x716
*24
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+8. In
4
X
( sinxtos x=1
Pittany=seex
ex fyra dx Sx= 232493 dx=25ec0 tonodo It cotx=csey
- (4 -
Naseco-4 seco tano do
= f*4 [secd+) tanodo (secou)
= ſztano-tanodo =2 Stone do=zfsecado-fzde
2sect to
X4
0
= 2tan 0-20 = &vx24
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0

Answer 1

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C

你一開始設定x=2secα
secα=x/2
sec-1x/2=α
把α當作sita，手機打不出來。