D. None. Say the obtuse angle is 100 degrees. Since the sum of all angles in a triangle cannot be bigger than 180, it's not possible because 195 (100+95) is greater than 180 degrees.
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There are no restrictions on the domain of the since function.
The domain is all real numbers.
Answer:
D.Any irrational number added to any irrational number is equal to a rational number.
