Giải PTLG sau:
\(cos^2x+2\left(sin3x-1\right)sin^2x\left(\dfrac{\pi}{4}-\dfrac{x}{2}\right)=0\)
GPT sau: \(4\sin\left(x+\dfrac{\pi}{3}\right)-2\sin\left(2x-\dfrac{\pi}{6}\right)=\sqrt{3}\cos x+\cos2x-2\sin x+2\)
giải pt \(cos\left(2x+\frac{2\pi}{3}\right)+3cos\left(x+\frac{\pi}{3}\right)+2=0\)
giải phương trình
2sin3x(1-4sin2x)=1
tanx+tan(x+\(\dfrac{\pi}{3}\))+tan(x+\(\dfrac{2\pi}{3}\))=3\(\sqrt{3}\)
4(sin6x+cos6x)+2(sin4x+cos4x)=8-4cos22x
Cos^2(pi/2+2x)-cos^2x-3cos(pi/2-2x)+2
\(cos\left(\dfrac{3\pi}{5}-2x\right)-4cos\left(x+\dfrac{\pi}{5}\right)=\sqrt{3}sin\left(x+\dfrac{7\pi}{10}\right)+2\sqrt{3}\)
Giải phương trình :3
giải pt
\(cos^2\left(\frac{\pi}{3}+x\right)+4cos\left(\frac{\pi}{6}-x\right)=4\)
Giải Pt
a. sin3x = sin \(\left(90^0-x\right)\)
b. cos(3x+ \(45^0\)) = -cosx
c. sin ( 2x+\(\frac{\pi}{3}\)) + sinx = 0
d. sin \(\left(x-\frac{2\pi}{3}\right)\)- cos2x=0
e. cos ( 2x - \(\frac{\pi}{4}\)) - sin ( 2x+\(\frac{\pi}{3}\)) =0
a,cos(2x-\(\dfrac{\pi}{\text{3}}\))-4cos(x-\(\dfrac{\pi}{\text{3}}\))+3=0
b,cos x+3sin\(\dfrac{\text{x}}{\text{2}}\)-2=0
Mng giúp em với ạ, em đang cần gấp ạ. Cảm ơn mng
