The greenhouse effect is related to

If $f(x) = \frac{\cos^2 x + \sin^4 x}{\sin^2 x + \cos^4 x}$ for $x \in R$,then $f(2002) = $

Photo-oxidation of chlorophyll is called

$\int \frac{1+\cos 4 x}{\cot x-\tan x} d x$ is equal to

The number of circles that touch all the straight lines $x+y=4$,$x-y=-2$,and $y=2$ is

The displacements of two particles of same mass executing $SHM$ are represented by the equations $x_1 = 4 \sin \left(10 t + \frac{\pi}{6}\right)$ and $x_2 = 5 \cos (\omega t)$. The value of $\omega$ for which the energies of both the particles remain same is (in $\text{ unit}$)