1. The MathJax filter must be active in the site with the default settings (Site administration -> Plugins -> Filters). 2. For better look of equations in MathJax filter settings the option "TeX filter compatibility" (filter_mathjaxloader | texfiltercompatibility) should be turned ON. 3. In any existing course open Question bank 4. Create a new question of type: Embedded answers (Cloze), with name: Cloze-T6 5. In question text editor open Tools -> Source code 6. Paste the following HTML text, then click Save:   <p><span style= "font-size: small; color: #008080;" >Fill the blanks.</span></p> <p> </p> <p><span style= "font-size: medium;" >By the theorem of integration by substitution we have:</span></p> <p><span style= "font-size: medium;" >$$\bullet \   \ \displaystyle\ int \tfrac{\sin \sqrt{x}}{\sqrt{x}}dx= \{ t =   $${ 1 :MC:~sin x~ 1 /x~=√x~ 1 /√x~sin√ x}$$ \} = $$ { 1 :SA:= 2 } $$ \displaystyle\ int   \sin tdt$$</span></p> <p> </p> <p><span style= "font-size: medium;" >$$\bullet \ \ \displaystyle\ int   \tfrac{ 3 \ln^ 3 x}{x}dx=\{t=$${ 1 :SAC:=lnx~=ln x}$$\}\displaystyle =   $$</span><span style= "font-size: medium;" >{ 1 :SA:= 3 } </span><span   style= "font-size: medium;" >$$\displaystyle\ int t^3dt$$</span></p> <p> </p> <p><span style= "font-size: medium;" >$$\bullet \ \ \displaystyle\ int   \sqrt{2x+ 1 }dx=\{t=$${ 1 :SAC:=2x+ 1 ~=x+ 1 / 2 ~=x+ 0 , 5 }$$\}   =$${ 1 :SA:= 1 / 2 ~= 0 , 5 ~= 0.5 }$$\displaystyle\ int t^{\frac{ 1 }{ 2 }} dt$$</span></p> <p> </p> <p> </p> <p><span style= "font-size: small;" ><span    style= "color: #ff0000;" ><strong>Attention! </strong></span>We use symbols:     a^b = $${ a^{b}}$$,   a/b =$${\frac{a}{b}}$$</span></p>   7. Click the "Decode and verify the question text" button, confirm there are 6 subquestions (1 Multiple choice and 5 Short answer). 8. Click the "Save changes and continue editing" button 9. Afterwards click the "Preview" option, or in questions list open preview for this question (Edit menu -> Preview) 10. The preview will display incorrectly three HTML text sequences instead if browser controls: <span class="nolink">qtypemultianswer1marker</span> <span class="nolink">qtypemultianswer3marker</span> <span class="nolink">qtypemultianswer5marker</span>