Solve this:

Q. Simplify using laws of exponents 

$$\begin{gathered} \left(a\right) \frac{{12}^2\times 9^3\times 5^6}{3^{10}\times 36} \frac{{25}^2 \times {36}^2}{45 \times 100} \\ \left(b\right) \frac{{121}^2\times {25}^5}{155\times 55\times 5^2} (2°+3°+4°) \times \left(1°\times 2°\times 3°\right) \\ \left(d\right) \frac{8^4\times 5^2\times 3\times 2^3}{\left({10}^2\right)\times 9\times {10}^2} \end{gathered}$$