3а выходит 3а !!!!!!!!гоощощо
- 4 p ( 8p + 6g) + 3g(8p- 3 g) = - 32 p^2 - 24 pg + 24 pg - 9g^2= - 32p^2 - 9 g^2 =
= - ( 32p^2 +9g^2) = - ( 32 ( 1/2)^2 + 9 ( 1/3)^2 ) = - ( 32 * 1/4 + 9 * 1/9)=
= - (8+1)= - 9
надо найти производную: y'=3x2+4x-84
2sin(2x) + 6sin(2x) = 7(1+cos(2x))
2sin(2x) + 6 sin(2x) = 7+7cos(2x)
8sin(2x)=7sin²x+7cos²x +7cos²x - 7sin²x
8sin(2x)= 14cos²x
16(sinx)*cos(x)-14cos²x=0
2cos (x) (8sin(x)-7cos(x))=0
cos(x)=0
x=π/2 + πn, n ∈ Z
8sin(x)-7cos(x)=0
8tg(x)-7=0
tg(x)=7/8
x=arctg(7/8) + πn, n ∈ Z