\(\Leftrightarrow2x-3=arccot\left(\dfrac{1}{4}\right)+k\pi\)
\(\Rightarrow x=\dfrac{3}{2}+\dfrac{1}{2}arccot\left(\dfrac{1}{4}\right)+\dfrac{k\pi}{2}\)
\(\Leftrightarrow2x-3=arccot\left(\dfrac{1}{4}\right)+k\pi\)
\(\Rightarrow x=\dfrac{3}{2}+\dfrac{1}{2}arccot\left(\dfrac{1}{4}\right)+\dfrac{k\pi}{2}\)
Giải pt
tan(2x+ \(\frac{\pi}{8}\)) + cot(x - \(\frac{3\pi}{4}\))=0
Giải các pt sau:
a) \(\sin\left(3x+60^o\right)=\dfrac{1}{2}\)
b) \(\cos\left(2x-\dfrac{\pi}{3}\right)=\dfrac{-\sqrt{2}}{2}\)
c) \(\tan\left(x+\dfrac{\pi}{6}\right)=\sqrt{3}\)
d) \(\cot\left(2x+\pi\right)=-1\)
Giải PT
a) sin2 x + 2sinx - 3 = 0
b) 2cos x + cos 2x = 0
c) tanx + cotx + 2 = 0
d) sinx + cos2x + 1 = 0
e) tan x + cot 2x = 0
giải pt: cot ( 4x/5 - 45 độ) = -1/2
Giải phương trình :
tanx/(1-tan^2x)=cot(x+pi/4)/2
1) Cot(4x+pi/4)+3=0
2) tan(1+2x)=2/3
giải các phương trình sau : a) \(\tan3x=\tan\frac{3\pi}{5}\) ; b) \(\tan\left(2x-1\right)=\sqrt{3}\) ; c) \(\cot2x=\cot\left(-\frac{1}{3}\right)\) ; d) \(\cot\left(\frac{x}{4}+20^o\right)=-\sqrt{3}\)
Giải các phương trình :
a) \(\tan\left(2x+45^0\right)=-1\)
b) \(\cot\left(x+\dfrac{\pi}{3}\right)=\sqrt{3}\)
c) \(\tan\left(\dfrac{x}{2}-\dfrac{\pi}{4}\right)=\tan\dfrac{\pi}{8}\)
d) \(\cot\left(\dfrac{x}{3}+20^0\right)=-\dfrac{\sqrt{3}}{3}\)
Tan^2(2x-pi/4)=3
Tan^2x+cot^2x=2