Who is asking: Parent
Level: Secondary
Question:
We have spent hours trying to solve the following identity without
success. Can you give us some hints as to how it is done?
1 + tan(x) tan(2x) = tan(2x) cot(x) -1
Thank you very much!
Hi Ron,
I used the expression for the tangent of 2x and manipulated the left side to get
For the right side, write the cotangent as 1 over the tangent and expand the tangent of 2x as I did above. Put the two terms over a common denominator and you should get the same expression that I have above.
Cheers,
Penny