cos^-1=?,sin^-1=?,tan^-1=?

你指tan-1=89.36340642個隻= =?

十分認同runnerACM既說話
語無倫次

i dun know what you want to ask , but i can tell you

sin^-1 x not equal to (sinx)-1 = cscx

we call sin^-1 as arc sin , which is the inverse function of sin.

for example , sin@ =k then @ = sin^-1 k .

Similarly , we call cos^-1 x and tan^-1 x as arccos and arctan respectivily.

for the index ,

(sinx)^-1 = 1/sinx=cscx (cosec)

(cosx)^-1=1/cosx=secx

(tanx)^-1 = 1/tanx = cot x

the above three are trigonometry function , you will not study that before f 5 / f 6

係囉...其實你先係最廢個位=.=

"1個2個都廢 "...
你就廢... 條問題都唔make sence... 你叫人計f'(x)但係又唔比x，得個arc function o係道想叫人計乜...

cos^-1=?,sin^-1=?,tan^-1=? ..都係計吾到..
但係cos x -1= -0.999999953
sin x -1= -0.017452405
tan x -1= -0.000304601

cos^-1=1/cos
sin^-1=1/sin
tan^-1=1/tan

2009-09-24 20:57:03 補充：
廢咩, 你又問得唔清唔楚, cos-1次方梗係=1/cos, 又唔比角度, 點比實數你呀勁人?你真係...唉,我都唔知點講, 你form幾呀細姪?