cosine

phet.colorado.edu

Add up sines or cosines to make waves of different shapes. Discover how changing the amplitudes of different harmonics changes the sound you hear. Play the Wave Game and combine harmonics to match a target waveform. Construct wave packets and explore the effects of changing the spacing between Fourier components and wave packet width.

phet.colorado.edu

Take a tour of trigonometry using degrees or radians! Look for patterns in the values and on the graph when you change the value of theta. Compare the graphs of sine, cosine, and tangent.