sin x = 0.8

2007-05-19 4:52 am
sin x = 0.8, find x

回答 (5)

2007-05-19 4:59 am
✔ 最佳答案
cosx = 0.8
x = 36.7˚ or 360˚ - x = 36.7˚
x = 36.7˚ or 323˚ (cor. to 3 sig.fig.)


P.S. cosx ≧ 0 in the 1st and 4th quadrants. So, there should be 2 distinct real roots for cosx = 0.8.
參考: Myself~~~
2007-05-22 4:48 am
cosx= 0.8
x=0.8cos^(-1)
x=(36.86989765............)度
參考: me
2007-05-19 5:09 am
哦~明白~~
cos x = 0.8, find x

cos x = 0.8
x=36.9 (準確至3位有效數字)

至於點計,就是....
你按計算機的SHIFT + cos (即cos -1) 後再按0.8就得la~
按完0.8後,你便可得出答案,
答案:36.86989765......
我覺得個答案是(準確至3位有效數字)比較好,即x=36.9

希望我能add到最佳答案~!
參考: 數學書(三角比)
2007-05-19 4:56 am
36,8698
first press shift + cos and then 0.8 and then EXE
if you are using fx-3650P casio ( calculator)
2007-05-19 4:56 am
x=36.86989..
or
x=323.1301024..
參考: me`


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