1)cos 3 x= -1 2) 6 sin^2 a-7 +6 cos^2 a 3)9 sin 2 x - 3 cos x + 2 sin x = 1 4) cos a =...

Question

1)cos 3 x= -1
2) 6 sin^2 a-7 +6 cos^2 a
3)9 sin 2 x - 3 cos x + 2 sin x = 1
4) cos a = 3/5, 0 ≤ a ≤ 30, sin a = ?

Answer 1

Hьмьжвюрллкршщmrgjdjjюмпгчд640$&&&8*267*37!