Question

Помогите решить ..............................

Answer 1

$1)\frac{tg(\pi-x) }{Cos(\pi+x)}*\frac{Sin(270^{o} +x)}{tg(270^{o}+x)}=\frac{-tgx}{-Cosx}*\frac{-Cosx}{-Ctgx}=\frac{tgx}{Ctgx}=\frac{tgx}{\frac{1}{tgx}}=tg^{2}x\\\\tg^{2}x=tg^{2}x$

$2)\frac{Sin(\pi-x) }{tg(\pi+x)}*\frac{Ctg(270^{o}+x) }{tg(270^{o}+x)}*\frac{Cos(2\pi-x) }{Sinx}=\frac{Sinx}{tgx}*\frac{-tgx}{-Ctgx} *\frac{Cosx}{Sinx}=\frac{Cosx}{Ctgx}=\frac{Cosx}{\frac{Cosx}{Sinx}} =\frac{Cosx*Sinx}{Cosx}=Sinx\\\\Sinx=Sinx$