-4х-6х-4х-3=0
-14х=3
х=-3/14
√2cos²x=cosx
√2cos²x-cosx=0
√2*cosx(cosx-√2/2)=0
cosx=0
x=π/2+π*n
cosx-√2/2=0
cosx=√2/2
x=+-π/4+2π*n
Б) [-7*π/2; -2π]
x=-7π/2
x=-3π
x=-2π
x=-π/4-2π=-9π/4
<span>3-х/5=х
3-x</span>÷5-x=0
3-x/5-x=0
3+(-1/5-1)x=0
3+(-6/5)x=0
3-6/5x=0
-6/5x+3=0
-6/5x=-3
6/5x=3
x=3÷6/5
x=5/2
<span>16x²-25=0
16x</span>²=25
x²=25/16
x<span>±5/4
x</span>₁=5/4
x₂=- 5/4
4sin²x+2sinxcosx-2cos²x=0/2cos²x
2tg²x+tgx-1=0
tgx=a
2a²+a-1=0
D=1+8=9
a1=(-1-3)/4=-1⇒tgx=-1⇒x=-π/4+πn,n∈z
a2=(-1+3)/4=1/2⇒tgx=1/2⇒x=arctg0,5+πk,k∈z