<span> y=x^6-3x^4-x+5
y'=6x^5-12x^3-1</span>
A) tg(180 - a) / ctg (90 - a) = -tg a / tg a = -1
б) (cos²(90 - α )-1) / cos (180 - α) = (sin<span>² α -1) / (-cos α) = </span>- cos² α / (-cos α) = cos a
в) sin (π-α) / tg (π+a) = <span>sin α / tg a = </span><span>sin α cos a / sin a</span> = cos a
F(x)=x^3+x
x^3+x≥0; x(x^2+1)≥0; x≥0
b)f(x)=sin^2 x
sin^2 x≥0 x-любое число