## Trigonometry (11th Edition) Clone

$2.3154725$ radian
Ensuring that the calculator is in radian mode, we enter $\cot^{-1} (-0.92170128)$ as $\tan^{-1} (\frac{1}{-0.92170128})$ into the calculator and solve: $\tan^{-1} (\frac{1}{-0.92170128})\approx-0.82612012$ radian Adding the solution to $\pi$ radian: $\pi+(-0.82612012)=2.3154725$ radian