trig
posted by Pallav
tan200(cot10tan10)

Reiny
keystrokes I used on my SHARP scientific calculator
I assume your units are degrees, so make sure your calc is set to DEG
1÷
tan 10

tan 10 =
x
ta200
=
you should get 2 
Reiny
sorry about the doublepost
proof of above:
tan200(cot10tan10)
= 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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