At what angle $$ is the torque on a current loop $85\mathrm{.}0\%$ of maximum?

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$($b$)$

At what angle $$ is the torque on a current loop $48\mathrm{.}0\%$ of maximum?

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$($c$)$

At what angle $$ is the torque on a current loop $17\mathrm{.}0\%$ of maximum?