<em>1) y=cosx</em>
<span> f ’(x)=26x-7</span>
<span><span>f ’(0)= 26*0-7=-7</span></span>
<span> f ’(-1)=26*(-1)-7=-33</span>
<span><span>f’(0) + f’(-1)=-7+(-33)=-40</span></span>