Question

ai giúp em giải câu 44 với ạ

Answer 1

\(tan3x=cotx\)

\(tan3x=tan\left(\dfrac{\pi}{2}-x\right)\)

\(3x=\dfrac{\pi}{2}-x+k\pi\left(k\in Z\right)\)

\(4x=\dfrac{\pi}{2}+k\pi\)

\(x=\dfrac{\pi}{8}+k.\dfrac{\pi}{4}\)