D) horizontal stretch
hope it helps
Answer: 37
Step-by-step explanation:
Well DCB is a right angle, and there is already half which is 53 degrees, subtract 90 by 53 and you will get your answer.

where

.
By continuity of

, you have

As

in the numerator, you approach

; in the denominator, you approach

. So you have an indeterminate form

. Provided the limit indeed exists, L'Hopital's rule can be used.

Now the numerator approaches

, while the denominator approaches

, suggesting the limit above is 2. This means