Monday

July 28, 2014

July 28, 2014

Posted by **Anonymous** on Tuesday, February 19, 2013 at 11:42am.

sin x + sin 2x + sin 3x + sin 4x = 0 ?

- maths-urgently needed -
**Steve**, Tuesday, February 19, 2013 at 3:37pmobviously any multiple of pi/2 will work

Also, since

sin pi/5 = sin 4pi/5 = 1/√8 (5-√5)

sin 2pi/5 = sin 3pi/5 = 1/√8 (5+√5)

any multiple of pi/5 will also work.

So,

x = pi(n/2)

x = pi(2n/5)

**Related Questions**

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

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

Calculus - Consider the function f(x)=sin(1/x) Find a sequence of x-values that ...

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

Calculus - Consider the function f(x)=sin(1/x) Find a sequence of x-values that ...

Calculus - Consider the function f(x)=sin(1/x) Find a sequence of x-values that ...

maths - Find the general solution of sin x + sin 2x + sin 3x + sin 4x = 0 ?

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

math - Eliminate the parameter (What does that mean?) and write a rectangular ...

math - find all solutions in the interval [0,2 pi) sin(x+(3.14/3) + sin(x- 3.14/...