Thursday

April 17, 2014

April 17, 2014

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

**Related Questions**

tigonometry - expres the following as sums and differences of sines or cosines ...

Trigonometry - Find the general solution of the following equation. sin (5x) = ...

Cos-Derivative - y= (cos^3 x) (cos 3x) I got -3 sin(3x) cos^3x - 3 sin(x) cos (...

algebra - Can someone please help me do this problem? That would be great! ...

calculus - Evaluate the integral of (x)cos(3x)dx A. (1/6)(x^2)(sin)(3x)+C B. (1/...

Math, derivatives - Let g(x) = sin (cos x^3) Find g ' (x): The choices are a) -...

Math - Calculus - The identity below is significant because it relates 3 ...

Trig check my work please? - 8 sin²(3x) cos²(3x) = 2 [2 sin(3x) cos(3x)]² = 2 [...

trig - I dont understand this. can you please tell how you got each answer? ...

pre-cal - Simplify the given expression........? (2sin2x)(cos6x) sin 2x and cos ...