Question

Please please help me

Answer 1

`(√(11) )/(6)`

Explanation:

Using the Pythagorean identity

sin²x + cos²x = 1, then

cosx =
`√(1-sin^2x)`

cosΘ =
`√(1-(5/6)^2)`

=
`\sqrt{1-(25)/(36) }` =
`\sqrt{(11)/(36) }` =
`(√(11) )/(6)`