- (UNIFOR) Se α = 2 arccos (2−1), então tg α é igual a
a) -3
d) 33
b)-1
e) 3
c) -33
- (MACKENZIE) O valor da expressão E = arcsen 21 + arcsen (-1) + arcsen 23 é
a) 43π
c) 23π
e) π
b) 65π
d) 0
- (ESC. NAVAL) Considerando que a função f(x)=cos(x), 0≤x≤π, é inversível, o valor de
tg [arccos(52)] é
a)-521
d) 2521
b)-254
e) 221
c) -221
- (UEPB) Dado y = cos [2arcsen(32)], temos que
a) y = 3
b) y= rac{4}{3}
c) y = 91
d) y = 23
e) y = 31
![Question image: 1. (UNIFOR) Se $\alpha$ = 2 arccos $(\frac{-1}{2})$, então tg $\alpha$ é igual a
a) -$\sqrt{3}$
d) $\frac{\sqrt{3}}{3}$
b)-1
e) $\sqrt{3}$
c) -$\frac{\sqrt{3}}{3}$
2. (MACKENZIE) O valor da expressão E = arcsen $\frac{1}{2}$ + arcsen (-1) + arcsen $\frac{\sqrt{3}}{2}$ é
a) $\frac{3\pi}{4}$
c) $\frac{3\pi}{2}$
e) $\pi$
b) $\frac{5\pi}{6}$
d) 0
3. (ESC. NAVAL) Considerando que a função $f(x) = cos(x)$, $0 \leq x \leq \pi$, é inversível, o valor de
tg $\left[arccos \left(\frac{2}{5}\right)\right]$ é
a)-$\frac{\sqrt{21}}{5}$
d) $\frac{\sqrt{21}}{25}$
b)-$\frac{4}{25}$
e) $\frac{\sqrt{21}}{2}$
c) -$\frac{\sqrt{21}}{2}$
4. (UEPB) Dado y = cos $\left[2arcsen \left(\frac{2}{3}\right)\right]$, temos que
a) y = 3
b) y=$ rac{4}{3}$
c) y = $\frac{1}{9}$
d) y = $\frac{3}{2}$
e) y = $\frac{1}{3}$](https://prod-meuguru-guruia-assets.s3.sa-east-1.amazonaws.com/BDJF9mZcsBgdGiD-D7SoTrG7z?X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Content-Sha256=UNSIGNED-PAYLOAD&X-Amz-Credential=ASIAQXTC4KK6VHWDNWKH%2F20250910%2Fsa-east-1%2Fs3%2Faws4_request&X-Amz-Date=20250910T194751Z&X-Amz-Expires=900&X-Amz-Security-Token=IQoJb3JpZ2luX2VjEIz%2F%2F%2F%2F%2F%2F%2F%2F%2F%2FwEaCXNhLWVhc3QtMSJHMEUCICb49m0zc3avieynfmfIu2GqbPxUgi66ioJSar%2FKyAArAiEA2JQkUR2J9fEesy4qsp69l00go%2B63ivljqbA3ouTySlEq7gMI9f%2F%2F%2F%2F%2F%2F%2F%2F%2F%2FARACGgwwNTA2NzMyNDI4MTMiDNlQ4vvvEUKenmj20CrCA3MVagevbO%2Br27sid1xMMRM9yXsaN%2BDWW1a1aceGldpqvEfpPYHC2dRpRTE4z3jfPfDVpdc0LMp8vyMqLhBm4uQIQfrLDoCkc5eK5iKnaL4mEIJQ630vVbt4F8DrIHri6C%2FpqsP0jI3U5FznlHK4H52kpYsDi5j7t9wO8oGliXrAQfAYQ%2BWfwzQo1vb3ANSOwmc%2FOURP0uEk7%2FUljJ6k%2F%2BBFz6ppxQSgoEEDwdN1Kmm%2BOZ4CBqNjSRp4%2FFJ%2BM4WGMMaHJii1Wu9g8zWbHZBEXrJvdwpJnAomWEKrJBJMITV5GbejqbHcTssdnwT96edvjnMGM1iuGeF2tCqoAXdCeXR8tW4FvhF8EAUl73mA24Z8HYY7h2U3cm3r99Fqgn3%2BMVkrbAEsndoVa2wrntfTlgoLAicAhdIWeht5bHd12FHAJimlfV3p3R%2FY7I83JAVIIFn1iKSrMDuIJV8OMS8de6hIkPrjMFbDsTQnof%2FfDoCcxG5dB%2B8%2BG5xk%2Bwgp%2F9D2bJw5Kz%2BpXyqwYTjXTIX6g9memr4kQhQxV3rUr6IaIdrpDkCFODSeJ7YJoGbBjdKa5h41MJdBSgxnLXtWCSwV%2B7wGsjD0p4fGBjqlAcBz2aM30nTnNpc1jbmiM463og%2F5nZsXbHFIWeMWn1Yz6I5H%2Bsi2oOqzVxiBBFRz0H7igsVVbVb2OXZigrg5it2butDrqhDgK78fD6lT9jLubruTZ736p%2Bnw6vTTlzCVvC9LIXBhah2oyavlXmfmtlfPnWFA0NWDvgfGxOOJR%2F9tpEqX0xosWaHCZaYYlJ3CPcQzpushtb75u%2F0ywMIt1CkeBmfZFA%3D%3D&X-Amz-Signature=b2b5855e8ef8df511cbc8ebfe04d897e3fd9d7fc7ee4e23b3c1a2ad34e156e9e&X-Amz-SignedHeaders=host&x-amz-checksum-mode=ENABLED&x-id=GetObject "1. (UNIFOR) Se $\alpha$ = 2 arccos $(\frac{-1}{2})$, então tg $\alpha$ é igual a
a) -$\sqrt{3}$
d) $\frac{\sqrt{3}}{3}$
b)-1
e) $\sqrt{3}$
c) -$\frac{\sqrt{3}}{3}$
2. (MACKENZIE) O valor da expressão E = arcsen $\frac{1}{2}$ + arcsen (-1) + arcsen $\frac{\sqrt{3}}{2}$ é
a) $\frac{3\pi}{4}$
c) $\frac{3\pi}{2}$
e) $\pi$
b) $\frac{5\pi}{6}$
d) 0
3. (ESC. NAVAL) Considerando que a função $f(x) = cos(x)$, $0 \leq x \leq \pi$, é inversível, o valor de
tg $\left[arccos \left(\frac{2}{5}\right)\right]$ é
a)-$\frac{\sqrt{21}}{5}$
d) $\frac{\sqrt{21}}{25}$
b)-$\frac{4}{25}$
e) $\frac{\sqrt{21}}{2}$
c) -$\frac{\sqrt{21}}{2}$
4. (UEPB) Dado y = cos $\left[2arcsen \left(\frac{2}{3}\right)\right]$, temos que
a) y = 3
b) y=$ rac{4}{3}$
c) y = $\frac{1}{9}$
d) y = $\frac{3}{2}$
e) y = $\frac{1}{3}$")
