$\lim_{x\to\frac{\pi}{2}}\left(3cos\left(-5x\right)sec\left(-3x\right)\right)$
$\pi-\frac{1}{4}$
$-12+1+6$
$4s^2+12s+9$
$1+2+3+1+2+3$
$\sqrt{192}+\sqrt{27}$
$8^{x-1}=64^{x-1}$
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