The bleaching action of $SO_2$ is due to its:

Who proposed the cell theory for plants?

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

Under which of the following conditions will a convex mirror of focal length $f$ produce an image that is erect,diminished and virtual?

$\int \frac{dx}{\sqrt{x}(x+9)}$ is equal to

Observe the following statements :
$A: \int \left(\frac{x^2-1}{x^2}\right) e^{\frac{x^2+1}{x}} d x = e^{\frac{x^2+1}{x}} + c$
$R: \int f^{\prime}(x) e^{f(x)} d x = f(x) + c$
Then which of the following is true?