Thursday

December 18, 2014

December 18, 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

**Answer this Question**

**Related Questions**

Conjecture - what conjecture could be made and proven from the following? sin(3x...

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

Mathematics - Trigonometric Identities - Let y represent theta Prove: 1 + 1/tan^...

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

TRIG! - Posted by hayden on Monday, February 23, 2009 at 4:05pm. sin^6 x + cos^6...

Precalculus with Trigonometry - Prove or disprove the following Identities: cos...

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

Trigonometry desperate help, clueless girl here - 2. solve cos 2x-3sin x cos 2x...

trig - Reduce the following to the sine or cosine of one angle: (i) sin145*cos75...

Trigonometry - 1.Solve tan^2x + tan x – 1 = 0 for the principal value(s) to two ...