解答sec[arctan(-3/5)]麻烦解一下,顺便再解释一下.sec[arctan(-3/5)]

解答sec[arctan(-3/5)]麻烦解一下,顺便再解释一下.sec[arctan(-3/5)] sec(arcsin(3/4))怎么解答 arctan(-2)+arctan(-3)=? 求arctan(5/3)等于多少度? sec（5pai／3）＝? 求arctan（1／5）＋arctan（2／3）答案为 派／4 请解释高数例题：1、∫tan ^2 x sec xdx 2、∫1/x^2+4 dx 3、∫tanx dsec^(n-2) x1、∫tan ^2 x sec xdx =∫tan xd（sec x）=secx tanx -∫sec xd(tanx)2、∫1/x^2+4 dx =1/2arctan(x/2) +c3、∫tanx dsec^(n-2) x=(n-2)∫sec^(n-3) xtan^2 xd 求值 arctan根号3 arctan√3 arctan 证明 1 arctan（1／5）＋arctan（2／3）＝派／4 2 aectan（3／4）＝2arctan（1／2） 不定积分,为什么∫(sec^2t-1)^2 dsect=1/5(sec^5t)-2/3(sec^3t)+sect+C? 为什么∫(sec^2t-1)^2 dsect=1/5(sec^5t)-2/3(sec^3t)+sect+C? 求∫(x*arctan x)/(1+x*x)做变换,令arctan x=t,x=tan t,dx=sec² t dt=∫ t*(tan t)*(sec t) dt=∫ td(sec t)=t*(sec t)-∫ (sec t)dt=t*(sec t)-ln|（sec t）-（tan t）|=(√(1+x² ))*（arctan x）-ln|x+(√(1+x²))|+c2.但是不知 cos[arcsin3/5+arctan(-三分之根号3)] 英语翻译Hey any e-mails from u or me I want u to teach me how to + pictures to the e-mail ok?+ are you in sec 1 sec 2 or sec 3 sec Is there sec 5 what is after sec Is it already cold over there is there snow? arctan√3和arctan(1/√3)等于多少 tan[arctan(-根号3/3)] 和 arctan(tan3兀/4)