I was discovered long ago, but not in the form this riddle wants

Question

I’m taught in high schools around the world.
Something that’s
described by me is often mispronounced as something bad.
Another has
something to do with the sun.
Said aloud I can sound a little like an
incantation, and for the mathematically inclined I can be very
useful.
My ending matches with something that caused a lot of fuss in
the late 19th century.
The opposites of my parts can be used to find
a greek letter, used right.
I’m a sequence of letters, often
capitalised, often memorised.

What am I?
Hint 1:

Spandan · Accepted Answer

Okay, I think I got it. I think you're:

I’m taught in high schools around the world.

Something that’s described by me is often mispronounced as something bad.

Another has something to do with the sun.

Said aloud I can sound a little like an incantation, and for the mathematically inclined I can be very useful.

My ending matches with something that caused a lot of fuss in the late 19th century.

The opposites of my parts can be used to find a greek letter, used right.

I’m a sequence of letters, often capitalised, often memorised.

And the hint!

Stiv · Answer

You are a:

I’m taught in high schools around the world.

Something that’s described by me is often mispronounced as something bad.

Another has something to do with the sun.

Said aloud I can sound a little like an incantation, and for the mathematically inclined I can be very useful.

My ending matches with something that caused a lot of fuss in the late 19th century.

This is the only part I am not entirely certain of right now...

The opposites of my parts can be used to find a greek letter, used right.

I’m a sequence of letters, often capitalised, often memorised.

As for the title:

I was discovered long ago, but not in the form this riddle wants

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