Jana is proving that the following trigonometric identity is true: cos(−θ)⋅tanθ=sinθ Which step would be the first line of her proof? cosθ⋅tanθ=sinθ cos(−θ)⋅tan(−θ)=sinθ cos(−θ)⋅tanθ=sin(−θ) cosθ⋅tan(−θ)=sinθ

Which of the following are independent events? a) knowing that it is going to rain tomorrow, and bringing an umbrella to schoolb) knowing that you have to get up early tomorrow, and going to bed before 9 p.mc) knowing that it is going to rain tomorrow, and going to bed before 9 p.md) knowing that you have a test in school tomorrow, and studying thw night before