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...fraction with a denominator under 106! That makes

**22**/7 a particularly good approximation to pi for such a small denominator.... It has been known and**used**since antiquity to approximate pi in rational calculations...5 Answers · Science & Mathematics · 12/07/2013

...case, since

**22**.5 is half of 45, you just set x = 45 degrees then tan(**22**.5) becomes tan(45/2)**Using**the formula, it becomes tan(45/2) = [1 - cos(45)] / sin(45) It just so...2 Answers · Science & Mathematics · 14/07/2012

here's the rule you need: log(m^n) = n · log(m) log(7^x) =log(

**22**) -> x · log(7) = log(**22**) x · log(7)/log(7) = log(**22**)/log(7) x = log(**22**)/log(7)3 Answers · Science & Mathematics · 28/03/2013

sin(-

**22**.5) =-sin(**22**.5)**Using**the half-angle identity sin^2(**22**.5) = (1-cos(45))/2 = (1-(1/sqrt(2)))/2 = (sqrt(2)-1)/2sqrt(2) = (2-sqrt(2))/4 => sin(-**22**.5) = -(1/2)sqrt(2-sqrt(2))1 Answers · Science & Mathematics · 04/11/2008

cos2A = 2cos²A - 1 => cos45 = 2cos²(

**22**.5) - 1 => √2/2 = 2cos²(**22**.5) - 1 => cos²(**22**.5) = (√2/2 + 1)/2 i.e. cos²22.5 = √2/4 + 1/2 => (√2 + 2)/4 so, cos22.5 = √(√2 + 2)/2 :)>3 Answers · Science & Mathematics · 05/07/2013

Assume that you have a segment of length 1 and a segment of length sin(pi/

**22**). You could**use**these to construct an angle of pi/**22**, which would be the exterior angle of a 44-gon...2 Answers · Science & Mathematics · 11/02/2015

9x - 4y = 26 18x + 7y =

**22**By elimination method, multiply the first equation by -2 and solve for y...1 Answers · Science & Mathematics · 01/03/2011

...and Tan 45° = Tan (2*

**22**.5°) Therefore 1 = Tan (2***22**.5°).**Using**the double angle formula for tangent, which is Tan 2x = (2Tanx)/(1...2 Answers · Science & Mathematics · 11/04/2016

(6x-17)^2=

**22**36x^2 - 102x - 102x +289 =**22**36x^2 -204x -267 - 0 x = { 204 +/- sqrt[(-204)^2 - 4(36)(-267)] } / 2(36) = {204 +/- sqrt(41616 - 38448)} / 72 = {204 +/- 56.285} / 72 = 3.615 or 2.052 abswer ----> C)2.05 is one of the possible answers2 Answers · Science & Mathematics · 08/04/2012

tan x = opposite / adjacent =

**22**/ 3 So the hypotenuse of that triangle equals square root (**22**^2 + 3^2...3 Answers · Science & Mathematics · 08/03/2012