<span>sin^2 a * tg a - cos^2 a=</span><span>= sin^3 a / cos a - 1+ sin^2 a =</span><span>= sin^3 a / sqrt(1-sin^2 a) - 1+ sin^2 a =</span><span>= 1/27 / sqrt(1-1/9) -1 + 1/9 = </span><span>= 1/(9sqrt(8) -8/9 = </span><span>= (sqrt(2)-32)/36</span>
Ответ: (2x-1+3y)(2x-1-3y)
(x^4)/4 +1/2 ln (x^2 +1)