Question

sen {2x - pi/4} = - 1/^2

Answer 1

Sen { 2x - π/4} = -1/2
⇒ 2x - π/4 = 3π/2 ⇒ 2x = 3π/2 + π/4 ⇒
⇒ 2x = 6π/4 + π/4 ⇒ 2x = 7π/4 ⇒ x = 7π/8

logo x = 7π/8