Calculate limit with floor function or prove it doesnt exist Please help calculating the following limit:
$$  \lim_{x\to\frac{\pi}{2}} \frac{\lfloor{}\sin(x)\rfloor}{\lfloor x\rfloor}  $$
I used $$ t = x - \frac{\pi}{2} $$ and got:
$$  \lim_{t\to 0} \frac{\lfloor{}\sin(t+\frac{\pi}{2})\rfloor}{\lfloor t+\frac{\pi}{2}\rfloor}  $$
for t close to 0 we get from arithmetic of limits that the denominator is 1 but not sure how to go from here..
Thanks

The floor function is continuous on $\Bbb R\setminus \Bbb Z$ so 
$$\lim_{x\to\frac\pi2}\lfloor x\rfloor=\left\lfloor\frac\pi2\right\rfloor=1$$
and since
$$0\le \sin x<1\,\forall x\in I:=(0,\pi)\setminus\{\frac\pi2\}$$
hence $\lfloor \sin x\rfloor=0\;\forall x\in I$ so the desired limit is $0$.
