kjkjkjkj4210 kjkjkjkj4210 29-01-2024 Mathematics contestada Let f_n = integrate (sum k = 1 to n sinᵏ - 1 x)(sum k = 1 to n (2k - 1) * sinᵏ - 1 x) * cos x dx from 0 to pi/2. Find f_21 - f_20.
