Question

cos(8 × π) / 7 × cos(π) / 7 × sin(8 × π) / 7 × sin(π) / 7

Answer 1

можно лучшим?

cos(8 × π) / 7 × cos(π) / 7 × sin(8 × π) / 7 × sin(π) / 7 = $\frac{cos(8xm)}{7} * \frac{cos(m)}{7}*\frac{sim(8x\pi )}{7} * \frac{sin(m)}{7} = \frac{cos(8mx)}{7} *\frac{cos(m)}{7} * \frac{sin(8\pi x)}{7} *\frac{sin(m)}{7} = \frac{soc(8mx)cos(m)sin(8\pi x)sin(m)}{2401}$