Question

Which expression is equivalent to (cos x)(tan(-x))?

Answer 1

Heres an example :)
= tan(- x).cos²(x) → you know that: tan(- x) = - tan(x)

= - tan(x).cos²(x) → you know that: tan(x) = sin(x)/cos(x)

= - [sin(x)/cos(x)].cos²(x) → you simplify by cos(x)

= - [sin(x)].cos(x)

= - sin(x).cos(x)

= - (1/2).sin(2x)

Hope This Helps!!!

Answer 2

yes thank you so much!! :)