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

The first line of her proof is  

Step-by-step explanation:

The given trigonometric identity is .

Jana has to recall that, the cosine function is an even function.

For that matter, .

Jana has to apply this property by substituting for in the given identity to obtain,

.

Note that, the sine and the tangent functions are odd functions, therefore,

and

Hence, the correct answer is option C.

3 1/3 x 2 3/5 = 8 2/3

step-by-step explanation:

just multiply the first number by the second number to get your answer.

the graph in the attached figure

step-by-step explanation:

we have

using a graphing tool

the graph in the attached figure

the roots are ( x-intercepts) x=-0.5,x=1,x=3

the y-intercept is the point (0,3)