Q.11" Let "x^(cos y)+y^(cos x)=5." Then "

Let y = cosx (cosx - cos 3x) . Then y is

Let y = cosx (cosx - cos 3x) . Then y is

Let y=f(x) satisfy the differential equation y'+((sin x-cos x)/(e^(-x)-cos x))y=(1)/(e^(-x)-cos x) ,then find the solution

If y= (cos x)^((cos x)^((cos x)……oo)) , then show that (dy)/(dx)= (y^(2) tan x)/(y.log cos x-1)

Let x, y, in R satisfy the condition such that sin x sin y + 3 cos y +4 sin y cos x=sqrt(26) . The value of tan^(2)x + cot^(2)y is equal to

Let x, y, in R satisfy the condition such that sin x sin y + 3 cos y +4 sin y cos x=sqrt(26) . The value of tan^(2)x + cot^(2)y is equal to

Let x and y be real numbers such that (sin x)/(sin y)=3 and (cos x)/(cos y)=(1)/(2). The value of (sin2x)/(sin2y)+(cos2x)/(cos2y) is (i)(49)/(58)(ii)(41)/(58)(iii)(51)/(58)( iv) none of these