# PreCalc

h t t p : / / w w w . j i s k h a . c o m / d i s p l a y . c g i ? i d = 1 2 6 0 2 2 5 7 6 7

ok this is what i mean. For exmaple take this problem that I asked for help with before

Naturalists find that the populations of some kinds of predatory animals vary periodically. Assume that the population of foxes in a certain forest varies sinusoidally with time. Records started being kept when t = 0 years. A minimum number, 200 foxes, occured when t = 2.9 years. The next maximum, 800 foxes, occurred at t = 5.1 years

use the formula I provided in other post

using points in problem that are max and min

max (A,B) = (5.1, 800)
A = 5.1
B = 800
Min = (C, D) = (2.9, 200)

plug and chug and you get the sinusodial funciton.

my question was how to rearange that formula for A, B, C, D, X, given all the other variables

you can just show me the formula if you want sense the work is probably a lot

I really need to know how to rearange the formula given all but X and the other formulas for A, B, c, D, or a second priority but is still something I need to know how to do but don't know how to

thanks

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1. C = 2.9
D = 200
forgot to mention that put I implied that

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2. No. Reread my post, that is the way to procede.

the amplitude is max-min divided by 2

The max occures at PI/2. Set all in the sine function to PI/2 at the max, That gives you one equaiton. Then, set all in the sine function equalto 3PI/2 for the min,and you should see enough equations to solve all those variable.

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3. khalybalak

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