Question

If cos x = .75, what is sin x?

0.87

0.75

0.66

0.69

Answer 1

okay so you have to solve for x and then plug that value into the sin(x) function

Answer 2

looks like they want the answer to be positive.

sin(x) = sqrt(1 - cos^2(x))

Answer 3

do sqrt(1 - (0.75)^2)

Answer 4

so it would be 0.66?

Answer 5

or would you round?

Answer 6

actually i think its just a simple arccos question

\[\cos(x) = .75\]
\[x = \cos^-1(.75)\]

and then plug that value into sin(x)

Answer 7

ohhh ok thanks

Answer 8

but either way you get the same answer .661

Answer 9

Thanks alot!