a:1:{i:0;a:13:{s:2:"id";s:3:"606";s:7:"answer1";s:250:"<p><img class="latex" src="https://chart.googleapis.com/chart?cht=tx&amp;chf=a,s,000000|bg,s,FFFFFF00&amp;chl=%5Clim_%7Bh%20%5Crightarrow%20%5Cinfty%7D%7B%5Cfrac%7Bf(x_0%2Bh)-f(x_0)%7D%7Bh%7D" alt="\lim_{h \rightarrow \infty}{\frac{f(x_0+h)-f(x_0)}{h";s:7:"answer2";s:250:"<p><img class="latex" src="https://chart.googleapis.com/chart?cht=tx&amp;chf=a,s,000000|bg,s,FFFFFF00&amp;chl=%5Clim_%7Bh%20%5Crightarrow%20%5Cinfty%7D%7B%5Cfrac%7Bf(x_0%2Bh)-f(h)%7D%7Bh%7D" alt="\lim_{h \rightarrow \infty}{\frac{f(x_0+h)-f(h)}{h}" /";s:7:"answer3";s:247:"<p><img class="latex" src="https://chart.googleapis.com/chart?cht=tx&amp;chf=a,s,000000|bg,s,FFFFFF00&amp;chl=%5Clim_%7Bh%20%5Crightarrow%200%7D%7B%5Cfrac%7Bf(x_0%2Bh)-f(x_0)%7D%7Bh%7D" alt="\lim_{h \rightarrow 0}{\frac{f(x_0+h)-f(x_0)}{h}" /></p>";s:7:"answer4";s:243:"<p><img class="latex" src="https://chart.googleapis.com/chart?cht=tx&amp;chf=a,s,000000|bg,s,FFFFFF00&amp;chl=%5Clim_%7Bh%20%5Crightarrow%200%7D%7B%5Cfrac%7Bf(x_0%2Bh)-f(h)%7D%7Bh%7D" alt="\lim_{h \rightarrow 0}{\frac{f(x_0+h)-f(h)}{h}" /></p>";s:7:"answer5";s:0:"";s:7:"answer6";s:0:"";s:7:"answer7";s:0:"";s:7:"answer8";s:0:"";s:7:"answer9";s:0:"";s:8:"answer10";s:0:"";s:4:"good";s:10:"0010000000";s:8:"question";s:4:"1866";}}