Register Now

Login

Lost Password

Lost your password? Please enter your email address. You will receive a link and will create a new password via email.

222-9+11+12:2*14+14 = ? ( )

Toán Lớp 11: Phương trình lượng giác cơ bản cos ( pi /5 – x ) = -1

Toán Lớp 11: Phương trình lượng giác cơ bản
cos ( pi /5 – x ) = -1

Comments ( 2 )

  1. \(\begin{array}{l}\cos \left(\dfrac \pi 5-x\right)=-1\\\Leftrightarrow \left[ \begin{array}{l}\dfrac \pi 5 -x=\pi+k2\pi\\\dfrac \pi 5 -x=-\pi+k2\pi\end{array} \right.\\\Leftrightarrow \left[ \begin{array}{l}x=-\dfrac{4\pi}5+k2\pi\\x=\dfrac{6\pi}5+k2\pi\end{array} \right. \ (k\in \mathbb{Z})\end{array}\)

Leave a reply

222-9+11+12:2*14+14 = ? ( )

About Thu Giang