We know:

We have

Substitute:

**Only 4 and 10 meet the requirements of the question.**

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40 and 1 NOT, because 40 > 12

20 and 2 NOT, because 20 > 12

5 and 8 NOT because GCF(5, 8) = 1

**Answer:**

f'(x) = -1/(1 - Cos(x))

**Step-by-step explanation:**

The quotient rule for derivation is:

For f(x) = h(x)/k(x)

In this case, the function is:

f(x) = Sin(x)/(1 + Cos(x))

Then we have:

h(x) = Sin(x)

h'(x) = Cos(x)

And for the denominator:

k(x) = 1 - Cos(x)

k'(x) = -( -Sin(x)) = Sin(x)

Replacing these in the rule, we get:

Now we can simplify that:

And we know that:

cos^2(x) + sin^2(x) = 1

then:

C/-12 < 3 this is your translation. Hope it helps.

Theoretical probability is probability based on reasoning written as a ratio of the number of favorable outcomes to the number of possible outcomes. Hope this helps w/process of elimination of your answers. :D