$$\int_\limits0^1\left(\frac{x^2-2}{x^2+1}\right) d x=$$

If $$a=\sin 175^{\circ}+\cos 175^{\circ}$$, then

$$\int_\limits{-5}^5 \log \left(\frac{7-x}{7+x}\right) d x=$$

For every value of $$x$$, the function $$f(x)=\frac{1}{a^x}, a>$$ 0 is,