You are using an out of date browser. It may not display this or other websites correctly.
You should upgrade or use an
alternative browser.
-
pt <=> (sinx+1)(2sinx+3)=0
<=> sinx=-1
hoặc sinx=-3/2 (loại)
sinx=-1 <=> x=-pi/2 + k2pi
x>0 => k>1/4 =>k=1 =>x=3pi/2