User contributions for Zhenqi
9 December 2017
- 12:1412:14, 9 December 2017 diff hist −2 m 2017 AMC 10A Problems/Problem 22 →Solution
- 11:5611:56, 9 December 2017 diff hist 0 m 2017 AMC 10A Problems/Problem 23 →Solution
10 September 2017
29 June 2017
- 15:5315:53, 29 June 2017 diff hist +617 N 1972 AHSME Problems/Problem 20 Created page with "We start by letting <math>\tan x = \frac{\sin x}{\cos x}</math> so that sour equation is now: <cmath>\frac{\sin x}{\cos x} = \frac{2ab}{a^2-b^2}</cmath> Multiplying through an..."