JEE MAIN - Mathematics Hindi (2021 - 27th July Morning Shift - No. 20)

फ़ंक्शन का परिसीमा

$$f(x) = {\log _4}\left( {{{\log }_5}\left( {{{\log }_3}(18x - {x^2} - 77)} \right)} \right)$$ (a, b) हो। तो इंटीग्रल $$\int\limits_a^b {{{{{\sin }^3}x} \over {({{\sin }^3}x + {{\sin }^3}(a + b - x)}}} dx$$ का मान बराबर है _____________.
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