$$\sin 70 ^ { \circ } - \cos 80 ^ { \circ } + \cos 140 ^ { \circ }$$
$-0.00000000000000001$
$$0.9396926207859083 - 0.17364817766693041 + -0.7660444431189779$$
$$0.76604444311897789-0.7660444431189779$$
$$-0.00000000000000001$$
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