sec(x+y)=xy

lim_ (x rarr0) ((x + y) sec (x + y) -y sec y) / (x)

The general solution of the differential equation x.cos(y/x)(ydx+xdy)=y sin(y/x)(xdy-ydx) is (A) xy=c sec((x)/(y)) (B) y=xc sec((x)/(y)) (C) xy=c sec((y)/(x)) (D) None of these

If (sec x)^y = (sec y)^x then find dy/dx .

Solve the following differential equations : (dy)/(dx)+sec x.y=tanx(0 le x lt pi/2) .

sec^(2)x=(4xy)/((x+y)^(2)) is true if and only if

if x=sec x-tan x and y=cos ecx+cot x then prove xy+1=y-x

If z=sec^(-1)(x+(1)/(x))+sec^(-1)(y+(1)/(y)) where xy<0, then the possible value of z is (are)