float llTan(float arg)

Return the trigonometric tangent of the argument. The argument should be an angle in radians.

Angle whose tangent is to be found, in radians.

A float with the tangent of the argument.

• Inputs of -Infinity, Infinity and NaN result in NaN.
• If the angle is otherwise not between -9.22337e18 and 9.22337e18, the argument is returned unchanged.

float F;
F = llTan(1); // Sets F to approx. 1.557408, which is the tangent of 1 radian.
F = llTan(-1); // Sets F to approx. -1.557408, because that's the tangent of -1 radian.
F = llTan(0); // Sets F to 0, because that's the tangent of 0.
F = llTan(PI); // Sets F to approximately 0, which is the tangent of PI.
               // It isn't exactly 0 because of rounding/calculation errors.
F = llTan(1e20);  // Sets F to 1e20 because 1e20 is returned unchanged.

The tangent gives you the slope of an angle, that is, how much you advance vertically per each unit you advance horizontally.

llTan-example.lsl

default
{
    state_entry()
    {
        llOwnerSay("Calculate the slope given the angle. Please say the angle in chat.");
        llListen(0, "", llGetOwner(), "");
    }

    listen(integer chan, string name, key id, string msg)
    {
        float angle = (float)msg * DEG_TO_RAD;
        llOwnerSay("For an input angle of " + msg + ", you climb "
                   + (string)llTan(angle) + " m per each horizontal m");
    }
}

• llSin calculates the sine of the argument.
• llCos calculates the tangent of the argument.
• llAtan2 calculates the angle of a 2D vector.

• llAsin calculates the inverse sine of the argument.
• llAcos calculates the inverse cosine of the argument.

• float type and associated caveats and limitations.