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JEE MAIN - Mathematics Hindi (2021 - 20th July Morning Shift - No. 10)
समीकरण $${\tan ^{ - 1}}\sqrt {x(x + 1)} + {\sin ^{ - 1}}\sqrt {{x^2} + x + 1} = {\pi \over 4}$$ के वास्तविक मूलों की संख्या है:
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