Второй номер решите , отблагодарю

[latex]3arcsin(-\frac{\sqrt3}{2})-arctg(-1)+arccos(-\frac{\sqrt2}{2})=\\\\=-3\cdot \frac{\pi}{3}+\frac{\pi}{4}+(\pi -\frac{\pi}{4})=-\pi +\frac{\pi}{4}+\frac{3\pi}{4}=-\pi +\pi =0\\\\2)\; 25^{-\frac{1}{2}}\cdot (\frac{1}{5})^{-2}=\frac{1}{\sqrt{25}}\cdot 5^2= \frac{5^2}{5} =5\\\\3)\; sinx=0,5\; ,\; x=(-1)^{n}\frac{\pi}{6}+\pi n,\; n\in Z\\\\4)\; 3^{x+2}-5\cdot 3^{x}=12\\\\3^{x}\cdot 9-5\cdot 3^{x}=12\\\\4\cdot 3^{x}=12\; \; ,\; \; 3^{x}=3\; ,\; \; x=1\\\\5)\; log_4(x+1)=2\; ,\; \; x\ \textgreater \ -1\\\\x+1=4^2\\\\x=7[/latex]