It can work well here to simplify inside parentheses first.

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The correct selection is not show with your problem statement.
Answer:
0.24
Step-by-step explanation:
It is important to understand the meaning of orthocenter in respect to a triangle first. Ii is actually the intersection of all the altitudes within a triangle. The altitudes can be drawn from an angle to the opposite side but the line should create a right angle with the side of the triangle. In case of obtuse triangle, the three lines would meet outside the triangle. I hope the answer helps.