posted by Pallav


  1. Reiny

    keystrokes I used on my SHARP scientific calculator

    I assume your units are degrees, so make sure your calc is set to DEG

    tan 10
    tan 10 =

    you should get 2

  2. Reiny

    sorry about the double-post

    proof of above:

    = tan20(1/tan10 - tan10) , 9since by CAST tan200 = tan200)
    = tan20( 1 - tan^2 10)/tan10
    = 2tan10/(1 - tan^2 10) * ( 1 - tan^2 10)/tan10
    = 2

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