1)sin7cos23+sin23cos7+3=? 2)sin60cos26+cos64sin26-sin30=? 3)8sin25sin65деленное дробной чертой на cos40=? 4)tg12+tg33 деленное дробной чертой

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.

4) f(x) = ((x^7) (соs (x))) = (x^7) (соs (x)) = (7x^6) (-sn (x)) = (7x^6) + (sn (x)).