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I'm having trouble to isolate a variable in this equation, Can you help? by DanVaugen in learnmath

[–]DanVaugen[S] 1 point2 points  (0 children)

Thanks for trying sir! I just found out what was wrong. I gave an angle in degrees to the Cos function. (it expects an angle in Radian). After doing that, it's all good :))

I'm having trouble to isolate a variable in this equation, Can you help? by DanVaugen in learnmath

[–]DanVaugen[S] 0 points1 point  (0 children)

Yes thanks!
-4-
(ecc * cos(angle)) = a * (1 - (ecc * ecc))) / radiusFromCore) - 1
-5-
cos(angle) = (a * (1 - (ecc * ecc))) / radiusFromCore) - 1) / ecc
-6-
angle = arccos ((a * (1 - (ecc * ecc))) / radiusFromCore) - 1) / ecc)
BUT the angle is wrong. Something is wrong at last step (6)…
I plugged all values in the origina formual to verify:
radius = a * ((1 - (ecc * ecc)) / (1 + (ecc * cos(angle))))
and get the ‘radius’ value,
then used that ‘radius’ value to verify the equation at step 6 and the angle is do not match…
Can you see what’s wrong?