Timeline for "Known" Pythagorean identity? (reference request)
Current License: CC BY-SA 3.0
5 events
| when toggle format | what | by | license | comment | |
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| Jan 10, 2013 at 15:53 | comment | added | Michael Hardy | I had concluded that, like the special case $1+\tan^2\theta=\sec^2\theta$ and unlike the formula for the tangent of a sum, this identity should not depend on the fact that the circle is parametrized by arc length. But then I proved it by relying on the identity $\sec(\alpha+\beta)=\sec\alpha\sec\beta/(1-\tan\alpha\tan\beta)$. So this posting confirms that I didn't need to do it that way. | |
| Jan 10, 2013 at 15:43 | vote | accept | Michael Hardy | ||
| Jan 8, 2013 at 9:49 | history | edited | Hunter Spink | CC BY-SA 3.0 |
Changed indices to j's
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| Jan 7, 2013 at 16:50 | comment | added | Michael Hardy | You seem to be using "$i$" both as the imaginary unit and as the index in $\theta_i$ and $\lambda_i$. | |
| Jan 7, 2013 at 11:09 | history | answered | Hunter Spink | CC BY-SA 3.0 |