Resposta :
[tex] \sqrt{2} cossec \frac{\pi}{4}-cossec \frac{3\pi}{2} \\
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\sqrt2.\frac{1}{sen \frac{\pi}{4}}-\frac{1}{sen \frac{3 \pi}{2}} \\
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\sqrt2.\frac{1}{\frac{\sqrt2}{2}}-\frac{1}{-1} \\
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\sqrt2.\frac{2}{\sqrt2}+1 \\
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2+1=3[/tex]