I need help with this trig caching link is in descriptrion

Question

Link http://algebra2bits.com/GamesA2T/CA/TE58733.html

User is naturallog

password is e=2.71828

i know number 3 is 70.5 and 131.8

number 4 is i believe 60, 135, 225, and 300

i think number 1 is 60, but not sure and

number 2 is 4 i think but not sure

Answer 1

1.

60° is the reference angle. The condition is that x is not acute. Therefore the angles are 120°, 240°, and 300°.

2.

sin³ θ - sin θ = 0

sin θ (sin² θ - 1) = 0

sin θ = 0→ θ is 0° or 180°

sin² θ = 1

sin θ = ±1→ θ is 90º or 270º

4.

2(sin² x - cos² x) = 0

sin² x - cos² x = 0

(sin x + cos x)(sin x - cos x) = 0

sin x = - cos x→ x is 135° or 315°

sin x = cos x→x is 45° or 225°