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1.11.5 Integration by substitution and by parts (A-level only)

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Question 80

The torque τ\tauτ, in Newton-meters, applied to a rotating flywheel is modeled by τ(t)=12tsin⁡(2t)\tau(t) = 12t \sin(2t)τ(t)=12tsin(2t), where ttt is the time in seconds. The total angular impulse JJJ delivered between t=π6t = \frac{\pi}{6}t=6π​ and t=π4t = \frac{\pi}{4}t=4π​ is defined by the integral:

J=∫π6π412tsin⁡(2t) dt J = \int_{\frac{\pi}{6}}^{\frac{\pi}{4}} 12t \sin(2t) \, dt J=∫6π​4π​​12tsin(2t)dt

Given that J=aπ+bJ = a\pi + bJ=aπ+b, determine the exact value of the constant aaa and the exact value of the constant bbb.

Fully justify your answer.

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1.11.5 Integration by substitution and by parts (A-level only) Questions

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