trigo

**jsampaio** · November 11th 2007, 03:19 AM

how to do this:
x=0.7*cos(2*pi*200*t);
y=0.5*cos(2*pi*1000*t);
z=x+y;

**red_dog** · November 11th 2007, 04:47 AM

$\cos(2k\pi)=1,\forall k\in\mathbf{Z}$

**jsampaio** · November 11th 2007, 04:51 AM

i need how the way to get one result

**red_dog** · November 11th 2007, 04:53 AM

What is t? Is integer, rational, real?

**jsampaio** · November 11th 2007, 04:59 AM

x1=07*cos(2*pi*200*t);
x2=07*cos(2*pi*1000*t);

i need toknow how i do x1+x2

**topsquark** · November 11th 2007, 04:59 AM

Originally Posted by jsampaio

i need how the way to get one result

What result? What exactly is your question? Solve for z, solve for t, graph the system, etc.

-Dan

**jsampaio** · November 11th 2007, 05:04 AM

is for then put that in fourier is because AM signal modulation.

**topsquark** · November 11th 2007, 05:34 AM

Originally Posted by jsampaio

x1=07*cos(2*pi*200*t);
x2=07*cos(2*pi*1000*t);

i need toknow how i do x1+x2

$cos(a) + cos(b) = 2cos \left ( \frac{a + b}{2} \right ) ~ cos \left ( \frac{a - b}{2} \right )$

-Dan

Thread: trigo