Posted by **Nada** on Saturday, July 24, 2010 at 4:57pm.

a) Determine the equation of a sine function that would have a range of {y€R|-7<(or equal) Y <(or equal) 1} and a period of 135degrees.

b) determine the cosine function that results in the same function an part (a).

Any help provided will be greatly appreciated.

- Trig -
**Reiny**, Saturday, July 24, 2010 at 6:34pm
your range is 8, so you need

4cos ??

period = 360/k

360/k = 135

135k = 360

k = 8/3

so far we have

y = 4cos (8/3)Ø

that would give us a max value of 4, but we want our max to be 1, so we have to drop our curve by 3 units

final:

y = 4cos(8/3)Ø - 3

- Trig -
**Nada**, Saturday, July 24, 2010 at 9:09pm
Ok I was wondering why the zero with the slash was in the equation, i have never seen that before!

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