
Originally Posted by
freestar
$\displaystyle a = cot^-^1(x)$ given $\displaystyle tan^-^1(x) = \frac{\pi}{4}$
a = ?
No idea where to start I am guessing $\displaystyle cot^-^1 = \frac{1}{tan^-^1}$ but that is probably wrong. Help.
Edit: also tried
$\displaystyle \frac{1}{tan(a)}=x$
$\displaystyle x = tan (\frac{\pi}{4}) = 1$
$\displaystyle \frac{1}{tan(a)} = 1$
$\displaystyle tan(a) = 1$
$\displaystyle a = tan^-^11$
$\displaystyle a = \frac{\pi}{4}$
Not sure if it's right though. Can someone verify please?