Question
$\int_{\pi /4}^{\pi /2} {{\rm{cose}}{{\rm{c}}^2}xdx = } $
$ = - \left[ {\cot \frac{\pi }{2} - \cot \frac{\pi }{4}} \right] = 1$.
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$(A)$ $\alpha=0, k=8$
$(b)$ $4 \alpha-k+8=0$
$(C)$ $\operatorname{det}(P \operatorname{adj}(Q))=2^9$
$(D)$ $\operatorname{det}(Q \operatorname{adj}(P))=2^{13}$