`0 < A ,B < pi/4 ,cos (A+B) =4/5, sin (A-B) =5/13 => tan 2A=`

lim_(x to 0) (x tan 2X - X tan x)/((1 - cos 2X)^(2)) equals

lim_(x to 0) (x tan 2x -2x tan x)/((1- cos 2x)^(2)) equal

If y sin 45^0 cos 45^0 = tan^2 45^0 cos^2 30^0 then y =

If (xcos e c^2 30^0sec^2 45^0)/(8cos^2 45^0sin^2 60^0)=tan^2 60^0-tan^2 30^0, than x= (a)1 (b) -1 (c) 2 (d) 0

lim _( x to 0) (tan 2x -x)/( 3x - sin x)=

sec ^ (2) 12 ^ (0) - (1) / (tan ^ (2) 78 ^ (@))