[" Q13."cos(tan^(-1)3/4)=],[" O/4"],[" 0/4"],[" 0/5"],[" 3/5"]

cos^-1(4/5)+tan^-1(3/5)=

tan["cos"^(-1)4/5+"tan"^(-1)2/3]=

The coordinates of the point where the line joining P(3,4,1) and Q(5,1,6) crosses the XY PLANE (A) (-13/5, -23/5, 0) (B) (13/5, 23/5, 0) (C) (13/5, -23/5, 0) (D) (-13/5, 23/5, 0)

tan(cos^(-1)((3)/(5))+tan^(-1)((1)/(4)))

Prove that cos^(-1)((4)/(5))=tan^(-1)((3)/(4))

tan(cos^(-1)((4)/(5))+tan^(-1)((2)/(3)))=

tan [sin ^(-1)((3)/(5))-cos ^(-1)(-(4)/(5))]=

1/3gt0,3/4gt0impliestan^(-1)(1/3)-tan^(-1)(3/4) =tan^(-1)((1/3-3/4)/(1+1/3 . 3/4))=tan^(-1)((-5)/15)=tan^(-1)(1/3) =-tan^(-1)(1/3)

The value of tan [cos^(-1)(4/5)+tan^(-1) (2/3)] is :