Contact us
Choose a category below so we can get back to you as quickly as possible.
∵f(x)=cosx-1+cos²;x =cos²;x+cosx+1/4-5/4 =(cosx+1/2)²;-5/4又│cosx│≤1 ==>-1≤cosx≤1 ==>-1/2≤cosx+1/2≤3/2 ==>-3/2≤cosx+1/2≤3…
We and our partners use cookies and other technologies to analyze traffic and optimize your experience. View more info and control your cookies settings at any time in our Cookies Policy.