a:1:{i:0;a:13:{s:2:"id";s:3:"617";s:7:"answer1";s:209:"<p><img class="latex" src="https://chart.googleapis.com/chart?cht=tx&amp;chf=a,s,000000|bg,s,FFFFFF00&amp;chl=f'(x)%3D%5Cfrac%7B4x%5E3%2B6x%7D%7B(3%2Bx%5E2)%5E2%7D" alt="f'(x)=\frac{4x^3+6x}{(3+x^2)^2}" /></p>";s:7:"answer2";s:207:"<p><img class="latex" src="https://chart.googleapis.com/chart?cht=tx&amp;chf=a,s,000000|bg,s,FFFFFF00&amp;chl=f'(x)%3D%5Cfrac%7B6x-3x%5E2%7D%7B(3%2Bx%5E2)%5E2%7D" alt="f'(x)=\frac{6x-3x^2}{(3+x^2)^2}" /></p>";s:7:"answer3";s:195:"<p><img class="latex" src="https://chart.googleapis.com/chart?cht=tx&amp;chf=a,s,000000|bg,s,FFFFFF00&amp;chl=f'(x)%3D%5Cfrac%7B6x%7D%7B(3%2Bx%5E2)%5E2%7D" alt="f'(x)=\frac{6x}{(3+x^2)^2}" /></p>";s:7:"answer4";s:141:"<p><img class="latex" src="https://chart.googleapis.com/chart?cht=tx&amp;chf=a,s,000000|bg,s,FFFFFF00&amp;chl=f'(x)%3D1" alt="f'(x)=1" /></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:"1877";}}