Найдите область значений функции: y=1+sinx y=1-4cos2x

Question

Найдите область значений функции:
y=1+sinx
y=1-4cos2x

Answer 1

1) -1 ≤ Sinx ≤ 1
     0 ≤ 1 + Sinx ≤2
2) -1 ≤ Cos2x ≤ 1 | * (-4)
     4 ≥ -4Cos2x ≥ -4
                или
     -4 ≤ -4Сos2x  ≤ 4  | +1
     -3≤ 1 - 4Cos2x ≤ 5

Answer 2

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