Question

tgx*cosx=0 решите срочнооо

Answer 1

tgx*cosx=0
sinx/cosx*cosx=0
sinx=0
x=2πn,n€Z

Answer 2

$tgx*cosx=0\\tgx=0\\sinx=0\\x= \pi n\\cosx \neq 0\\x \neq \frac{ \pi }{2} + \pi n$