Math: $\displaystyle\sum_{n = 1}^\infty \left[a_n\cos\left(\dfrac{n\pi x}{L}\right)+b_n\sin\left(\dfrac{n\pi x}{L}\right)\right]$

hmmm....Study Fourier Series first....hehehehehe

Fourier series equation yan. Yung mga complex (sawtooth waves, triangular waves at iba pa) at mga panget na mga wave shapes ay kayang ma-decompose into sine and cosine waves.