f(x)=sin(x)cos(2x)+1
and it is known that the function is periodic, then how can I know the exact period of that function!?
any graphic solution or software cannot be used, just solve it matermatically!!
更新1:
to hckchn,still havent solved it, I dun think your equation is going to work and be able to show what eactly T is the graphical solution show the period is roughtly ~5.3 rather than 6.28 , which is definitely not equal to 2 pie much apperciated if there are some more better suggestion~~