数学题目。
展开全部
令 x = sect, 则 dx = sect tant dt, cost = 1/x, t = arccos(1/x),
I = ∫sect tant dt / [(sect)^3 tant] = ∫ dt / (sect)^2 = ∫ (cost)^2 dt
= (1/2)∫ (1+cos2t) dt = (1/2)t + (1/4)sin2t = (1/2)t + (1/2)sintcost
=(1/2)arccos(1/x) + √(x^2-1)/(2x^2) + C
I = ∫sect tant dt / [(sect)^3 tant] = ∫ dt / (sect)^2 = ∫ (cost)^2 dt
= (1/2)∫ (1+cos2t) dt = (1/2)t + (1/4)sin2t = (1/2)t + (1/2)sintcost
=(1/2)arccos(1/x) + √(x^2-1)/(2x^2) + C
推荐律师服务:
若未解决您的问题,请您详细描述您的问题,通过百度律临进行免费专业咨询