If \( (a, b) \) be the orthocentre of the triangle whose vertices are \( (1, 2) \), \( (2, 3) \) and \( (3, 1) \), and \( I_1 = \int_a^b x \sin(4x - x^2)\, dx \), \( I_2 = \int_a^b \sin(4x - x^2)\, dx \), then \( 36 \dfrac{I_1}{I_2} \) is equal to:
\( 88 \)
\( 72 \)
\( 66 \)
\( 80 \)
