$-546-713$

$\left(3a^2-5a+5\right)+\left(5a^2-7a-8\right)$

$\cos^2b\left(\sec^2b-1\right)=\sin^2b$

$\frac{10\left(x^2+x^3\right)}{x^2+x^3}$

$\cos\left(a-b\right)-\sin\left(a\right)\cdot\sin\left(b\right)$

$\left(5m+3\right)\cdot\left(3m-8\right)$

$\sin^21.1+\cos^21.1$