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October 8, 2015
Posted by **Natalie** on Sunday, April 7, 2013 at 1:27pm.

- Precalculus with Trigonometry -
**Reiny**, Sunday, April 7, 2013 at 3:38pmhttp://www.wolframalpha.com/input/?i=plot+sin%283x%29%2Fsin%28x%29+-+cos%283x%29%2Fcos%28x%29+

mmmhhhh?

let y = sin(3x)/sin(x) - cos(3x)/cos(x)

= (sin(3x)cos(x) - cos(3x)sinx)/(sinxcosx)

= sin(3x - x)/(sinxcos)

= sin(2x)/sinxcosx

= 2sinxcosx/(sinxcosx)

= 2

so it is a straight line y = 2 as shown in the graph