why do i get an error while using arcsin(x) function?

hi, im trying to use the arcsin function but i keep getting an error. when using the sin function, it works fine: sin(degtorad(45))

ans =

    0.7071

but when im trying to perform the invers calculation im getting error:

arcsin(0.7071)

Undefined function 'arcsin' for input arguments of type 'double'.

how to fix it?

Answer 1

[Thomas]

It is asin, not arcsin.

Answer 2

[Yao Li]

sind(45);
asind(0.7071);