Evaluate the following limits:

As we need to find

We can directly find the limiting value of a function by putting the value of the variable at which the limiting value is asked if it does not take any indeterminate form (0/0 or ∞/∞ or ∞-∞, .. etc.)

Let Z =

∴ we need to take steps to remove this form so that we can get a finite value.

TIP: Most of the problems of logarithmic and exponential limits are solved using the formula and

This question is a direct application of limits formula of exponential limits.

As x→ π/2

∴ cos x → 0

Let, y = cos x

∴ if x→ π/2 ⇒ y→0

Hence, Z can be rewritten as-

Use the formula:

∴ Z = 1

{∵ log e = 1}

Hence,