tim gia tri lon nhat va nho nhat cua ham so luong giac

N

nguyenbahiep1

đặt $sin^2 x = t , t \in [0;1]$
$f(t) = t^2+2t-3 \\ f'(t) = 2t+2 > 0 \forall t \in [0;1] \\ \Rightarrow Minf(t) =f(0) = -3 , max f(t) = f(1) = 0 $
 
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