arcsin
 

The function I need to perform is:

NPC Code:

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arcsin(tan(30°))

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But of course the graal engine doesn't supply both the arcsin and tan functions.
I found that:

NPC Code:

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arcsin = arctan(x / (1 - x * x)^.5);

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So what I have ended up with is:

NPC Code:

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tan = sin(30)/cos(30); // tan(a) = sin(a)/cos(a)

val = arctan(tan / (1 - tan * tan)^.5);

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But in (1 - tan * tan)^.5 I keep getting a negative value and because it's in a square root it's undefined.
The value I'm looking for is +/- 35.264° and I'm at a point where I am quite stuck at the moment.
Would anyone be able to help with this?

Would,

NPC Code:

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tan = sin(30)/cos(30); // tan(a) = sin(a)/cos(a)

val = arctan(tan / (abs(1 - tan * tan))^.5);

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work?

No matter I worked it out. Was just a matter of converting radians to degrees as Graal does things in radians.

NPC Code:

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tan = sin(30*(pi/180))/cos(30*(pi/180));

val = arctan(tan / (1 - tan * tan)^.5)*(180/pi));

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/me knows what delph is doing :) (isnt it supposed to be 27.8 degrees or something?)

I'm pretty sure it's not :\
Why, what do you think I'm doing?