Question

2sin(pi+t)+cos(pi/2-t)=-1/2

Answer 1

 

$2sin(pi+t)+cos(pi/2-t)=-1/2\ 2sin(pi+t)+sin(t) = -1/2\ -2sin(t)+sin(t) = -1/2\ -sin(t) = -1/2\ sin(t) = 1/2\ t = pi/6 + 2pi n\ t = 5pi/6 + 2pi n$

 

Answer 2

-2sin t + sin t= -1/2

- sin t= -1/2

sin t= 1/2

(t=pi / 6)вроде так