Use the rules of the lesson, without finding the individual angles, to evaluate sin⁻¹(-0.3) +…

Step 1. The first sum. The two terms are partners, for the same number $x = -0.3$ in $[-1, 1]$. So the sum is $\dfrac{\pi}{2} = 1.5708$.

Step 2. The second sum. $\cos^{-1}(-0.2) = \pi - \cos^{-1}0.2$. So the sum is $\cos^{-1}0.2 + \pi - \cos^{-1}0.2 = \pi = 3.1416$.