$$\lim_{x\to\infty}\left(6x\right)^{\frac{1}{11x}}$$

$$\left(140\cdot\:\:sin\left(a\right)\right)-\left(180\cdot\:\:sin\left(b\right)\right)=0$$

$$yx^2.zx^2$$

$$\lim_{t\to-7}\left(\frac{t^2+4t-21}{t-7}\right)$$

$$\frac{151}{4}+\frac{9}{4}$$

$$-16+43-2+67+31-101-45+16$$

$$x^2-\left(x-4\right)^2=128$$