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Ipostnikova0
@Ipostnikova0
August 2022
1
5
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1).cos x + sin(Pi/2 -x) + cos (Pi + x)=0
2). cos(Pi+x)=cos Pi/6
3). 7cos(x- 3pi/2)+5sin x+1=0
4). cos2x+cosx=-sin2x
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sedinalana
Verified answer
1
cosx+cosx-cosx=0
cosx=0
x=π/2+πn,n∈z
2
cos(Pi+x)=cos Pi/6
-cosx=√3/2
cosx=-√3/2
x=+-5π/6+2πn,n∈z
3
7cos(x- 3pi/2)+5sin x+1=0
-7sinx+5sinx=-1
-2sinx=-1
sinx=1/2
x=(-1)^n*π/6+πn,n∈z
4
cos2x+cosx=-sin2x
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Answers & Comments
Verified answer
1cosx+cosx-cosx=0
cosx=0
x=π/2+πn,n∈z
2
cos(Pi+x)=cos Pi/6
-cosx=√3/2
cosx=-√3/2
x=+-5π/6+2πn,n∈z
3
7cos(x- 3pi/2)+5sin x+1=0
-7sinx+5sinx=-1
-2sinx=-1
sinx=1/2
x=(-1)^n*π/6+πn,n∈z
4
cos2x+cosx=-sin2x