Question

Pls help me...........

Answer 1

`(4)/(5)`

Explanation:

Using the Pythagorean identity

sin²x + cos²x = 1, then

sin²x = 1 - cos²x

sinx =
`√(1-cos^2x)`

note that cosΘ =
`(6)/(10)` =
`(3)/(5)`

sinΘ =
`√(1-(3/5)^2)`

=
`\sqrt{1-(9)/(25) }`

=
`\sqrt{(16)/(25) }` =
`(4)/(5)`