Let $$[\cdot]$$ denote the greatest integer function. Then $$\int_{-\frac{\pi}{2}}^{\frac{\pi}{2}} \left(\frac{12(3+[x])}{3+[\sin x]+[\cos x]}\right)dx$$ is equal to:

The integral to evaluate is $$\int_{-\frac{\pi}{2}}^{\frac{\pi}{2}} \left(\frac{12(3+[x])}{3+[\sin x]+[\cos x]}\right)dx$$, where $$[\cdot]$$ denotes the greatest integer function.

The interval $$[-\frac{\pi}{2}, \frac{\pi}{2}]$$ is divided into subintervals based on the values of $$[x]$$, $$[\sin x]$$, and $$[\cos x]$$, which are constant in each subinterval. The subintervals and the corresponding values are determined as follows:

- For $$x \in [-\frac{\pi}{2}, -1)$$: $$[x] = -2$$, $$[\sin x] = -1$$, $$[\cos x] = 0$$.

Denominator: $$3 + (-1) + 0 = 2$$.

Numerator: $$12(3 + (-2)) = 12 \times 1 = 12$$.

So, the integrand is $$\frac{12}{2} = 6$$.

- For $$x \in [-1, 0)$$: $$[x] = -1$$, $$[\sin x] = -1$$, $$[\cos x] = 0$$.

Denominator: $$3 + (-1) + 0 = 2$$.

Numerator: $$12(3 + (-1)) = 12 \times 2 = 24$$.

So, the integrand is $$\frac{24}{2} = 12$$.

- For $$x \in [0, 1)$$: $$[x] = 0$$, $$[\sin x] = 0$$, $$[\cos x] = 0$$.

Denominator: $$3 + 0 + 0 = 3$$.

Numerator: $$12(3 + 0) = 12 \times 3 = 36$$.

So, the integrand is $$\frac{36}{3} = 12$$.

- For $$x \in [1, \frac{\pi}{2}]$$: $$[x] = 1$$, $$[\sin x] = 0$$ for $$x \in [1, \frac{\pi}{2})$$, $$[\cos x] = 0$$.

Denominator: $$3 + 0 + 0 = 3$$.

Numerator: $$12(3 + 1) = 12 \times 4 = 48$$.

So, the integrand is $$\frac{48}{3} = 16$$ (and at $$x = \frac{\pi}{2}$$, it is 12, but this point has measure zero).

The integral is split accordingly:

$$\int_{-\frac{\pi}{2}}^{\frac{\pi}{2}} f(x) dx = \int_{-\frac{\pi}{2}}^{-1} 6 dx + \int_{-1}^{0} 12 dx + \int_{0}^{1} 12 dx + \int_{1}^{\frac{\pi}{2}} 16 dx$$

Evaluating each integral:

- $$\int_{-\frac{\pi}{2}}^{-1} 6 dx = 6 \left[ x \right]_{-\frac{\pi}{2}}^{-1} = 6 \left[ -1 - \left(-\frac{\pi}{2}\right) \right] = 6 \left( -1 + \frac{\pi}{2} \right) = -6 + 3\pi$$

- $$\int_{-1}^{0} 12 dx = 12 \left[ x \right]_{-1}^{0} = 12 \left[ 0 - (-1) \right] = 12 \times 1 = 12$$

- $$\int_{0}^{1} 12 dx = 12 \left[ x \right]_{0}^{1} = 12 \left( 1 - 0 \right) = 12$$

- $$\int_{1}^{\frac{\pi}{2}} 16 dx = 16 \left[ x \right]_{1}^{\frac{\pi}{2}} = 16 \left( \frac{\pi}{2} - 1 \right) = 16 \times \frac{\pi}{2} - 16 \times 1 = 8\pi - 16$$

Summing these results:

$$(-6 + 3\pi) + 12 + 12 + (8\pi - 16) = 3\pi + 8\pi + (-6 + 12 + 12 - 16) = 11\pi + (24 - 22) = 11\pi + 2$$

Thus, the integral evaluates to $$11\pi + 2$$.

Comparing with the options:

A. $$15\pi + 4$$

B. $$11\pi + 2$$

C. $$12\pi + 5$$

D. $$13\pi + 1$$

The correct option is B.

11$$\pi$$+2