Question

Given that sin A = 1/3
and angle A is in the first quadrant, find cos A.

Answer 1

\[\cos A=\sqrt{1-\sin ^2A}\]

Answer 2

sooo (1/3)^2 -1

Answer 3

http://screencast.com/t/YM8G3sGx

Answer 4

1 - (1/3)

Answer 5

\[\sqrt{1-\left( \frac{ 1 }{ 3 } \right)^2}=\sqrt{1-\frac{ 1 }{ 9 }}=\sqrt{\frac{ 8 }{ 9 }}=\frac{ 2\sqrt{2} }{ 3 }\]

Answer 6

ah yes

Answer 7

thank you

Answer 8

also.. is tan (3π/2) =

Answer 9

is the solution undefined?