Simplify expression cos^2(pi/2-x) / √1-sin^2(x) =

Step-by-step explanation:

To simplify this expression you must use the following trigonometric identities

    I

     II

Remember that

Only if  for all x

If f(x) is not greater than 0 for all x then

Now we have the expression:

then using the trigonometric identities I and II we have to:

is not greater or equal than 0 for all x. So.

Finally