1. 5cos2x + 12cos x + 7 = 0 2. 10cos2x + 17sin x – 16 = 0 3. 2sin2x + 9sin x cos x + 4cos2x = 0 4. 4 tg x – 6ctg

Question

Алгебра: 1. 5cos2x + 12cos x + 7 = 0 2. 10cos2x + 17sin x – 16 = 0 3. 2sin2x + 9sin x cos x + 4cos2x = 0 4. 4 tg x – 6ctg x + 5 = 0 5. 8sin2x + 3sin 2x = 14cos2x 6. 2sin2x – 7cos 2x = 6sin 2x + 7

theonestop1234 · Answer

Решила только первые 2 остальные вряд ли успею(( вот формулы которыми нужно пользоваться :

cos(2α)=cos2(α)−sin2(α)

cos(2α)= 1−2·sin2(α)

cos(2α)= 2·cos2(α)−1

1. 5cos2x + 12cos x + 7 = 0 2. 10cos2x + 17sin x – 16 = 0 3. 2sin2x + 9sin x cos x + 4cos2x = 0 4. 4

1. 5cos2x + 12cos x + 7 = 0 2. 10cos2x + 17sin x – 16 = 0 3. 2sin2x + 9sin x cos x + 4cos2x = 0 4. 4 tg x – 6ctg x + 5 = 0 5. 8sin2x + 3sin 2x = 14cos2x 6. 2sin2x – 7cos 2x = 6sin 2x + 7

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