Lista de exercícios do ensino médio para impressão
Considering the following functions

$\phantom{XX} \operatorname{arc\,sin:}[-1, +1] \rightarrow [ - \pi / 2, \pi / 2 ]\phantom{XX}$ and $\phantom{XXX} \operatorname{arc\,cos:} [-1, + 1] \rightarrow [0, \pi[\phantom{XX}$ ,

the value of $\phantom{X}cos(\operatorname{arc\,sin} \dfrac{3}{5} + \operatorname{arc\,cos} \dfrac{4}{5})\phantom{X}$ is:

a)
$\;\dfrac{6}{25}\;$
b)
$\;\dfrac{7}{25}\;$
c)
$\;\dfrac{1}{3}\;$
d)
$\;\dfrac{2}{5}\;$
e)
$\;\dfrac{5}{12}\;$

 



answer: (B)
×