Mathematics Stack Exchange is a question and answer site for people studying math at any level and professionals in related fields. Join them; it only takes a minute:

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

The question given was - solve all the equations that are possible to solve without a calculator. (This is a part of it) Please try to solve this question (obviously without a calculator) if it's possible. :) thanks in advance.

All values are in degrees

share|cite|improve this question
We are mathematicians, how do you even know the value exists ;-) – dcs24 May 6 '14 at 11:24
Using calculator the answer is 1. I am not able to reach it. :| – Harshal Gajjar May 6 '14 at 11:27
Hence, the answer is 1. – evil999man May 6 '14 at 11:27
(-1) for that, Awesome. – Harshal Gajjar May 6 '14 at 11:28
Hint: What is $\tan 225^{\circ}$, and use the addition formula for tan. – Macavity May 6 '14 at 11:29
up vote 5 down vote accepted

Hint: $\tan(\alpha + \beta)=\dfrac{\tan(\alpha)+\tan(\beta)}{1-\tan(\alpha)\tan(\beta)}$ and $\tan(225^\circ)=1$.

share|cite|improve this answer
Thank you. :) The answer is 1. – Harshal Gajjar May 6 '14 at 11:43

Your Answer


By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.