求助高数题:证明恒等式arctan1/2+arctan1/3=45度 cos(arcsinx)=根号(1-x^2)在线急

来源：学生作业帮编辑：作业帮分类：数学作业时间：2024/05/12 23:53:16

求助高数题:证明恒等式arctan1/2+arctan1/3=45度 cos(arcsinx)=根号(1-x^2)在线急等!

tan(arctan1/2+arctan1/3)
=[tan(arctan(1/2))+tan(arctan(1/3))]/[1-tan(arctan(1/2))*tan(arctan(1/3))
=(1/2+1/3)/(1-1/2*1/3)=1
arctan1/2+arctan1/3=pi/4
x=sint,-pi/2

求助高数题:证明恒等式arctan1/2+arctan1/3=45度 cos(arcsinx)=根号(1-x^2)在线急 arctan1/3+arctan1/2+arctan1=几, 证明恒等式：arctanx+arctan1/x=π/2(x>0) 证明arctan1/2+arctan1/3=45° arctan1/2+arctan1/5+arctan1/8= 求证恒等式：arctanX+arctan1/X=派/2 求证arctan1/2+arctan1/5+arctan1/8=pai/4 arctan1/2+arctan1/5+arctan1/3 证明arctanx+arctan1/x=兀/2 (x>0) 证明当x>0,arctanx+arctan1/x=π/2 A=arctan1/2 点样证明arctanx+arctan1/x=pi/2