The product $\left(1+\tan 1^{\circ}\right)\left(1+\tan 2^{\circ}\right)\left(1+\tan 3^{\circ}\right)$ $. .\left(1+\tan 45^{\circ}\right)$ equals

  • [KVPY 2010]
  • A

    $2^{21}$

  • B

    $2^{22}$

  • C

    $2^{23}$

  • D

    $2^{25}$

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