$$\cos ^ { - 1 } \frac { 4 } { 5 } + \cos ^ { - 1 } \frac { 12 } { 13 } = \sin ^ { - 1 } \frac { 56 } { 65 }$$
$\text{false}$
$$0.9999025240093042 ^ {-1} + 0.9998702249713747 ^ {-1} = 0.015036116155904633 ^ {-1}$$
$$\frac{5000000000000000}{4999512620046521}+0.9998702249713747^{-1}=0.015036116155904633^{-1}$$
$$\frac{5000000000000000}{4999512620046521}+\frac{10000000000000000}{9998702249713747}=0.015036116155904633^{-1}$$
$$\frac{99988637449033945000000000000000}{49988638081531419141346073224187}=0.015036116155904633^{-1}$$
$$\frac{99988637449033945000000000000000}{49988638081531419141346073224187}=\frac{1000000000000000000}{15036116155904633}$$
$$\text{false}$$
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