Pinexam——There is royal road to learning.

## What number can you add to the numerator and denominator of 813 \frac{8}{13} 138​ to get 6?

(A)-4

(B) -12

(C)-14

(D)4

(E)13

Explanation

If g(x) = csc x tan x, then which of the following trigonometric functions is equivalent to g(x) ? (Note: csc x = , sec x = , and cot x = )

（A）g(x) = sin x （B） g(x) = cos x （C） g(x) = tan x （D） g(x) = csc x （E） g(x) = sec x