Відповіді АЛГЕБРА: 19.26-27

19.26

1) x^–3; 2) x^–9; 3) x^–2; 4)x^–2018

19.27

f(x) = sinx – cosx;

1) f(0) = sin0 – cos0 = 0 – 1 = –1;

2) f(π3) = sinπ3 – cosπ3 = 32 – 12

3) f(π4) = sinπ4 – cosπ4 = 22 – 22 = 0;

4) f(π2) = sinπ2 – cosπ2 = 1 – 0 = 1.