2. Seja $cosseca = \frac{5}{4}$, determine o val r das expre...

Seja $cosseca = \frac{5}{4}$ , determine o val r das expressões:

a) $sena$

b) $tga$

c) $25sen^2a - 9tg^2a$

$2. Seja $cosseca = \frac{5}{4}$, determine o val r das expressões: a) $sena$ b) $tga$ c) $25sen^2a - 9tg^2a$$

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