This has been on my mind for a while, but I never bothered to ask an explanation
For the general solution:
![](https://latex.codecogs.com/png.latex?\bg_white cos\theta = 0 )
Using the yr11 formula, we should get
![](https://latex.codecogs.com/png.latex?\bg_white \theta = 2\pi n \pm \frac{\pi}{2} )
But some textbooks have: (cambridge)
(iirc)
Why does this happen?
edit: and how did they get this? is there a special technique or is it only
that there is this special property
And are there also other trig functions with special cases? (e.g. other cos solutions?)
I know this is actually MX1 but this is seen mainly in MX2 (complex/polys)
Someone please explain, because this has been on my mind ever since I did complex numbers![Frown :( :(](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
For the general solution:
Using the yr11 formula, we should get
But some textbooks have: (cambridge)
Why does this happen?
edit: and how did they get this? is there a special technique or is it only
And are there also other trig functions with special cases? (e.g. other cos solutions?)
I know this is actually MX1 but this is seen mainly in MX2 (complex/polys)
Someone please explain, because this has been on my mind ever since I did complex numbers
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