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Q12: <span class="ql-formula" data-value="3 x ^ { 2
Q44: <span class="ql-formula" data-value="y ^ { \prime }
Q75: <span class="ql-formula" data-value="\frac{d y}{d x}=y^{2}-9"><span class="katex"><span class="katex-mathml"><math
Q85: <span class="ql-formula" data-value="\int \cot ^ { n
Q121: <span class="ql-formula" data-value="\begin{array} { l } y
Q168: <span class="ql-formula" data-value="\int \frac { x +
Q180: <span class="ql-formula" data-value="\int _ { 0 }
Q265: <span class="ql-formula" data-value="\int \frac { \cos \theta
Q273: <span class="ql-formula" data-value="\int \frac { x ^
Q284: <span class="ql-formula" data-value="\frac { 4 x +