Question

Помогите пожалуйста срочно любую

Answer 1

$1)Sin(-frac{45pi} {6})=-Sin(8 pi- frac{pi} {2})=Sin frac{pi} {2}=1\\2)Sint=frac{sqrt{2}} {2}\ t=(-1)^{n}arcSin frac{sqrt{2}} {2}+ pi n\ t=(-1)^{n} frac{pi} {4}+ pi n\\ Cost=0\t=pi /2 + pi n$

4) Cos6 > 0

$Sin(- frac{5pi} {9})=-Sin( frac{5pi} {9})<0\ Cos6Sin(-frac{5pi} {9})<0$