The percentage error in measurement of a physical quantity $m$ given by $m = \pi \tan \theta $ is minimum when $\theta $ $=$ .......... $^o$ (Assume that error in $\theta $ remain constant)

  • A

    $45$

  • B

    $90$

  • C

    $60$

  • D

    $30$

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  • [AIEEE 2012]