Question

ctgx = 1 надо найти х= ? [0° ;180°]​

Answer 1

$\displaystyle\bf\\Ctgx=1\\\\\\x=\frac{\pi }{4} +\pi n,n\in Z\\\\\\x=45^\circ+180^\circ n,n\in Z\\\\\\Otvet:x=45^\circ$