Изменения

# <tex>a_k = \dfrac{1}{\pi} \times cdot \displaystyle\int_{-\pi}^{\pi} {f(x) \times cdot \cos {kx} \;dx}</tex># <tex>b_k = \dfrac{1}{\pi} \times cdot \displaystyle\int_{-\pi}^{\pi} {f(x) \times cdot \sin {kx} \;dx}</tex># <tex>c_k = \dfrac{1}{2 \pi} \times cdot \displaystyle\int_{-\pi}^{\pi} {f(x) \times cdot e^{-ikx} \;dx}</tex>