Решите неравенство x^3+6x^2+(21x^2+3x-12)/(x-4) <=3

помогите решить

 sinx + 4cos^2x=1

^2-квадрат

 Помогите выплнить задание.

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2. I like reading English.
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3. We know of her coming to Leningrad.
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4. In describing Moscow we must begin with Red Square.
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5. We were waiting for his coming.
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6. On coming home he saw many friends.
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7. I knew of his coming here.
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8. He was going to the technical school.
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9. The girl studying at this technical school is my sister.
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10. They are playing tennis.
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11. Smoking is harmful.
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о чем заставило задуматься поэма пушкина ПОЛТАВА

 плииииииз очень надоооо

Упростить выражение: 1. sin*6x+3sin*4xcos*2x+3sin*2xcos*4x+cos*6x
(*3 означает в третьей степени)
2. tg*2(пи/4)+2tg(пи/4)ctg(пи/4)+ctg*2(пи/4)
3. 2sin*2(пи/6)(sin(пи/6)/cos(пи/6)+cos(пи/6)/sin(пи/6))ctg(пи/6)
4. ( sin(x+y)-cosxsiny )/cosy
5.( cos(-пи/12)-cos(3пи/4))/(sin(пи/12)-sin(5пи/4))
6. ( sin12x+sin8x+sin10x+sin9x+sin11x)/ (cos12x+cos8x+cos10x+cos9x+cos11x)
Найти значение: 7. 4sin(пи-пи/3)cos(пи/6)+4sin(7пи/6)cos(пи/3)