Posted by **Kate** on Tuesday, July 20, 2010 at 9:01pm.

how do I solve this

arcsin(4/5)

note that I am not looking for about 53 degrees

I believe I'm suppose to solve euler's formula for x

i.e.

sin (x) = (e^(ix) - e^(-ix))/(2i)

where x is in radians

hence I would do something like this

sin (x) = (e^(ix) - e^(-ix))/(2i) = 4/5

(e^(ix) - e^(-ix))/(2i) = 4/5

solve the equation above for x

this is were I need help if somebody could just show me quickly how to do this that would be great!!!

If I remeber correctly I need to use cis(x) or something right?

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