Question

Помогите пожалуйста решить! 

$2 cos x = sqrt{2}</var></p> <p> </p> <p><var>sin (5x - )frac{pi}{2} = frac{1}{2}$

 

$tg 3x = 1$

 

$ctgx = -1$

Answer 1

1)2cosx = √2

cos x = √2/2

x  = π/4

2)sin(5x-π/2) = 1/2

5x - π/2 = π/6

5x = 2π/3

x = 2π/15

3)tg 3x = 1

   3x = π/4

   x = π/12