arccos (- квадр. корень из двух / 2) - arcsin(-1) =

1) f(x) = ((соs (x))^2 (sn (x))^2) = ((соs (x))^2) ((sn (x))^2) = (соs (x)) * ((соs (x))^2) (sn (x)) * ((sn (x))^2) + = -2 * (sn (x)) * (соs (x)) 2 * (соs (x)) * (sn (x)) = -4 * (sn (x)) * (соs (x)).

2) f(x) = (x^(-3)) + 3x (соs (x))) = (x^(-3)) + (3x) (соs (x)) = (-3x^2) + 3 (-sn (x)) = (-3x^2) + 3 + (sn (x)).

3) f(x) = ((-3 / 5) * x^5 2x^4 + (1 / 2) * x^2 + 15) = ((-3 / 5) * x^5) (2x^4) + ((1 / 2) * x^2) + 1(5) = ((-3 / 5) * 5 * x^4 2 * 4 * x^3 + (1 / 2) * 2 * x^1 + 0 = -3x^4 - 12x^3 +x.