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.
Note: While modifying be careful that you don’t introduce any zero terms in the denominator
∵ cosec2x – 1 = cot2x
As, a2 – b2 = (a+b)(a-b)
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