(2x - 1)(2x + 1) - (2x + 3)² = 38
4x² - 1 - 4x² - 12x - 9 = 38
12x = - 48
x = - 4
(-y)^{3} y^ {4} = - y^{7}
(-Y) (-y) ^{2} = - y ^{3}
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1) 3sin(2x)-√3cos(2x)=0
√3/2sin(2x)-1/2cos(2x)=0
Sin(2x)*cosπ3-cos(2x)*sinπ/3=0
sin(2x-π/3)=0
2x-π/3=πn
2x=π/3+πn
x=π/6+π4/2
2) 2cos²x-sinx=-1
2-2sin²x-sinx+1=0
2sin²x+sinx-3=0
Пусть sinx=t ; |t|≤1
2t²+t-3=0
t1=1
t2=-3/2, посторонний корень
sinx=1
x=π/2+πn</span></span>
-sin3/4x+cos3/4x=0/cos3/4x
-tg3/4x+1=0
tg3/4x=1
3/4x=π/4+πn,n∈z
x=π/3+4πn/3,n∈z
А) 18х+9х^2=9х(2+х)
б) х*(х-4)-5*(х-4)=(х-5)(х-4)
в) 5*(х-5)-2х*(-5+х)=(5-2х)(х-5)
г) 5*(х-7)+х(7-х)=(х-7)(5-х)