1) sin2x*cosx+cos2x*sinx=0 2) sin5x*cos2x+cos5x*sin2x=1 3) sin4x*cosx-cos4x=1/2

Будем использовать:

y = f (g (x)), y' = f'u (u) * g'x (x), где u = g (x).

(x^n) ' = n * x^ (n-1).

(c) ' = 0, где c - const.

(c * u) ' = с * u', где с - const.

(sin (x)) ' = соs (x).

(соs (x)) ' = - sin (x).

(u ± v) ' = u' ± v'.

(uv) ' = u'v + uv'.

a) f (x) ' = (sin (x + sin (x)) ' = (x + sin (x)) ' * (sin (x + sin (x))) ' = ((x) ' + (sin (x)) ') * (sin (x + sin (x))) ' = (1 + соs (x)) * соs (x + sin (x)). b) f (x) ' = (x^20 - sin (x)) ' = (x^20) ' - (sin (x)) ' = 20 * x^ (20 - 1) - соs (x) = 20x^19 - соs (x). c) f (x) ' = ((соs (6x^2 + 9)) ^4) ' = (6x^2 + 9) ' * ((соs (6x^2 + 9)) ^4) ' = ((6x^2) ' + (9) ') * ((соs (6x^2 + 9)) ^4) ' = 12x * 4 * (-sin (6x^2 + 9)) ^3) = - 48x * sin (6x^2 + 9)) ^3. d) f (x) ' = ((соs (x)) ^2) ' = (соs (x)) ' * ((соs (x)) ^2) ' = (-sin (x)) * 2 * (соs (x)) = - 2 * (sin (x)) * (соs (x)).