Monday

October 20, 2014

October 20, 2014

Posted by **lan** on Thursday, May 12, 2011 at 7:45pm.

- trigonometry -
**Mgraph**, Thursday, May 12, 2011 at 8:37pmcos(2x)-1=-2sin^2(x)

sin(2x)=2sin(x)cos(x)

The equation is

-2sin(x)(sin(x)+cos(x))=0

sin(x)=0 or sin(x)+cos(x)=0

sin(x)=0==>x=pi,2pi,3pi,4pi

sin(x)+cos(x)=0,

sin(x)=-c0s(x)

tan(x)=-1==>x=3pi/4,7pi/4,11pi/4,15pi/4,

19pi/4

(E)

**Answer this Question**

**Related Questions**

trig - Find the sum of all of the solutions to the equation cos(2x) − sin2(x...

Trigonometry - Use the half-angle identities to find all solutions on the ...

Trigonometry - Use the half-angle identities to find all solutions on the ...

Trigonometry - Use inverse trigonometric functions to find the solutions of the ...

Math - Can I please get some help on these questions: 1. How many solutions does...

trig - 2sin(x)cos(x)+cos(x)=0 I'm looking for exact value solutions in [0, 3&#...

Trigonometry - Find all solutions of 4(cos(x))**2-4 sin(x)-5=0 in the interval (...

Trigonometry - Find all solutions between 0 and 2pi. Round to two decimal places...

Trigonometry - Directions: Use a graphing utility to approximate the solutions ...

Trigonometry - Find all solutions of 4 (cos (x)**2)-1=0 in the interval (6pi, ...