$$\left(-\frac{15}{8}\right)\left(0.12\right)\left(-4\right)$$

$$\tan\left(\cos^{-1}\left(\frac{3}{x}\right)\right)$$

$$\lim_{x\to\infty}\left(\frac{3^x+4^x}{4}\right)^{\frac{1}{x}}$$

$$\frac{-4ab^3}{2^{-2}a^0b^2}$$

$$t^2+11-42$$

$$\left(3x^3+4\right)\left(x^2+2\right)^3$$

$$\left(a^{x+1}+2b^{x-1}\right)\left(a^{x-1}+2b^{x+1}\right)$$