Giải phương trình :
\(\frac{\cos^2x-\sin^22x}{4\cos^2x}=\sin\left(x+\frac{\pi}{6}\right)\sin\left(x-\frac{\pi}{6}\right)\)
Giải phương trình:
a) \(Sin^22x+Cos^23x=0\)
b) \(Sin\left(x+\frac{\pi}{3}\right)Cos\left(x-\frac{\pi}{6}\right)=1\)
c) \(Cos^2x+Cos^22x+Cos^23x=1\)
\(\sin^6+\cos^6x=4\cos^22x\)
Giải phương trình: \(\left(1-\frac{1}{2\sin x}\right)\cos^22x=2\sin x-3+\frac{1}{\sin x}\)
10, giải pt
\(sin^8x+cos^8x=\frac{17}{16}cos^22x\)
\(\frac{\sin^22x-2}{\sin^22x-4\cos^2x}=\tan^2x\)
Giải PT
a) \(\left|\sin x-\cos x\right|+\left|\sin x+\cos x\right|=2\)
b) \(\tan x-3\cot x=4\left(\sin x+\sqrt{3}\cos x\right)\)
c) \(2\sin^2x-2\sqrt{2}\sin x+3\tan^22x-2\sqrt{3}\tan2x+2=0\)
a)sin^4\(\frac{x}{3}\) +cos^4\(\frac{x}{3}\)=\(\frac{5}{8}\)
b)4(sin^4x+cos^4x)+\(\sqrt{3}\)sin4x=2
c)cos^4x+sin^6x=cos2x
d)cos^6x+sin^6x=cos4x
2cos^2x+2cos^2x+4cos^3(2x)-3cos2x=5
giải pt
a, \(\sin^2x+\sin^22x+\sin^23x=\dfrac{3}{2}\)
b. \(\cos^2x+\sin^22x+\cos^23x=1\)
c,\(\sin5x+2\cos^2x=1\)
d,\(1+\tan x=2\sqrt{2}\sin\left(x+\dfrac{\pi}{4}\right)\)
e,\(\sin3x+\cos3x-\sin x+\cos x=\sqrt{2}\cos2x\)
