Trying a question from my textbook, although i seem to get a value of cos with an input greater than 1 which is confusing me, can anyone see where I went wrong?
#getting cos value larger than 1
humble vector
wild meadow
Input or output?
wild meadow
Yh it can be greater than one
humble vector
math error
humble vector
okay oops it looks like i copied down the wrong numbers
wild meadow
It’s b^2 + c^2 - a^2 for the numerator
humble vector
which is why i’m getting an impossible triangle
wild meadow
Yh
humble vector
It’s b^2 + c^2 - a^2 for the numerator
wait how come
wild meadow
okay oops it looks like i copied down the wrong numbers
There numbers should be fine
One sec lemme write it out and send a picture of it
humble vector
a^2 = b^2 + c^2 - 2bc*cosA, no?
humble vector
oh right
humble vector
It’s b^2 + c^2 - a^2 for the numerator
but this is still wrong no?
wild meadow
No
wild meadow
if you take away b^2+c^2 from both sides you get a^2-b^2-c^2=2bc*cosA
If you multiply both sides by negative 1 what do you get
Remember it’s negative 2bccosA
humble vector
OH right yeah