Sinxcosx=√3/4
sin2x=√3/2
2x=(-1)^N π/3+πN
x=(-1)^n π/6+π/2*n
(6х+1)-4(3+2х)=4
6х+1-12-8х=4
-2х-11=4
-2х=15
х=-7.5
7-7cos²x+8cosx-8=0
7cos²x-8cosx+1=0
cosx=t
7t²-8t+1=0
D=64-28=36
t1=(8-6)/14=1/7⇒cosx=1/7⇒x=+-arccos1/7+2πk,k∈z
t2=(8+6)/14=1⇒cosx=1⇒x=2πn,n∈z
1)x=-arccos1/7 U x=arccos1/7
2)x=0
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