trig

tan200(cot10-tan10)

asked by Pallav
  1. keystrokes I used on my SHARP scientific calculator

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

    1รท
    tan 10
    -
    tan 10 =
    x
    ta200
    =

    you should get 2

    posted by Reiny
  2. sorry about the double-post

    proof of above:

    tan200(cot10-tan10)
    = 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

    posted by Reiny
  3. Khavdaila answer

    posted by Golu
  4. Good

    posted by Golu

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