20/02/19 18:07:56 aOs+m1eu.net
>>557
cos(x-y) = 0 → x-y = ±π/2 → y = x ±π/2
→ cos(x) - cos(y) = cos(x) ± sin(x) = cos(±x) + sin(±x)
20/02/19 18:07:56 aOs+m1eu.net
>>557
cos(x-y) = 0 → x-y = ±π/2 → y = x ±π/2
→ cos(x) - cos(y) = cos(x) ± sin(x) = cos(±x) + sin(±x)