Question

hey dau coroana mă abonezi ofer puncte
De ce cos(336π+π)=cosπ??
Va rog cat mai repede!!​

Answer 1

$\cos(336\pi + \pi) \\ = \cos(\pi + 336\pi) \\ = \cos(\pi + 2 \cdot168\pi) \\ \implies \: \boxed{ \cos(t\pm2\cdot k\pi) = \cos(t) } \\ \\ \implies \cos(\pi + 2\cdot168\pi) \\ = \cos(\pi) \\ = -1$