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Solve the problem.
-Find the maximum value of subject to the following constraints.
Q39: <span class="ql-formula" data-value="\frac { \sec x }
Q121: Given that <span class="ql-formula" data-value="\mathrm
Q191: <span class="ql-formula" data-value="a = 6 \mathbf {
Q209: Given that <span class="ql-formula" data-value="\mathrm
Q217: <span class="ql-formula" data-value="\begin{array}{r}y \geq x^{2} \\x+y>3\end{array}"><span class="katex"><span
Q231: Cube roots of <span class="ql-formula"
Q236: <span class="ql-formula" data-value="\mathbf { u } =
Q279: <span class="ql-formula" data-value="\frac { 6 + 7
Q290: <span class="ql-formula" data-value="\tan \frac { 13 \pi
Q328: Let <span class="ql-formula" data-value="\mathbf {