Упростите выражение:
\({\largeа)}\ (a^2+2a+1)\cdot\left(\frac{1}{a+1}+\frac{1}{a^2-1}-\frac{1}{a-1}\right);\)
\({\largeб)}\ \left(1-\frac{9x^2+4}{12x}\right):\left(\frac{1}{3x}-\frac{1}{2}\right)+1;\)
\({\largeв)}\ 1-\left(\frac{2}{a-2}-\frac{2}{a+2}\right)\cdot\left(a-\frac{3a+2}{4}\right);\)
\({\largeг)}\ (y^2-4)\cdot\left(\frac{3}{y+2}-\frac{2}{y-2}\right)+5.\)