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January 31, 2015

January 31, 2015

Posted by **CJ** on Friday, January 14, 2011 at 11:13am.

equation from #1 is

y = 18.25 sin(pi/6 t - 2.09) + 61.15

where t is the time in months and January is t = 1.

- Trigonometry -
**Henry**, Saturday, January 15, 2011 at 7:30pmY = 18.25sin(t*pi/6 - 2.09) + 61.15.

Y = 18.25*sin(6*3.14/6 - 2.09) + 61.15,

Y = 18.25*sin(3.14 - 2.09) + 61.15,

Y = 18.25*sin(1.052) + 61.15,

Convert to degrees:

Y = 18.25*sin(1.052*57.3deg/rad) + 61.15,

Y = 18.25*sin(60.28) + 61.15,

Y = 16 + 61.15 = 77.15deg in June.

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