Question

Dado sen x=1/4 com 0 < x < r/2 calcule cos x

Answer 1

Resposta:

$\textsf{Leia abaixo}$

Explicação passo a passo:

$\mathsf{sen^2\:x + cos^2\:x = 1}$

$\mathsf{\left(\dfrac{1}{4}\right)^2 + cos^2\:x = 1}$

$\mathsf{cos^2\:x = 1 - \dfrac{1}{16}}$

$\mathsf{cos^2\:x = \dfrac{15}{16}}$

$\boxed{\boxed{\mathsf{cos\:x = \dfrac{\sqrt{15}}{4}}}}$