N
nhunhungyeuthuong


a, [tex]sin (x+\frac{pi}{6})+cos(\frac{pi}{3}-x)=1[/tex]
b, [tex]cos(\frac{pi}{18}-x)+sin(\frac{4pi}{9}+x)=sqrt{3}[/TEX]
c, [tex]cos^2(3X-\frac{pi}{4})-sin^2(5x+\frac{2pi}{3})=0[/tex]
d, [tex]tan(\frac{pi}{4}+x)+cotg(\frac{pi}{4}-x)=2[/tex]
e*[tex]sin^4x-sin^4(x+\frac{pi}{2})=2tanx[/tex]
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b, [tex]cos(\frac{pi}{18}-x)+sin(\frac{4pi}{9}+x)=sqrt{3}[/TEX]
c, [tex]cos^2(3X-\frac{pi}{4})-sin^2(5x+\frac{2pi}{3})=0[/tex]
d, [tex]tan(\frac{pi}{4}+x)+cotg(\frac{pi}{4}-x)=2[/tex]
e*[tex]sin^4x-sin^4(x+\frac{pi}{2})=2tanx[/tex]
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