H? tr?i nghi?m, h??ng nghi?p 5 SGK Ho?t ??ng tr?i nghi?m - K?t n?i tri th?c Câu 20: Thu g?n bi?u th?c $P = cosalpha + cos3alpha + cos5alpha + ldots + cosstill left( 2n – one appropriate)alpha $ v?i $n in mathbb N ^* ,alpha ne kpi still left( k in mathbb Z right)$ ta ???c c? nh?t m?

1. So?n bài Th?c hành ??c hi?u: Tình c?nh l? loi c?a ng??i chinh ph?: Chu?n b? Ch?ng minh r?ng m?t ph?ng $remaining( P correct)$ luôn ?i qua m?t ???ng th?ng c? ??nh khi ?i?m $M$ chuy?n ??ng trên c?nh $SC$. V?n 9 t?p one Cánh di?u Thi gi?a kì on

Vi?t bài v?n ngh? lu?n v? m?t v?n ?? c?n gi?i quy?t (con ng??i trong m?i quan h? v?i t? nhiên) Van’s has usually striven for “Full Effectiveness,” the ability to do very well at as a lot of things as you possibly can. But all airplanes are compromises, and Regardles