Do u have a photo of a triangle or something cuz im lost
Answer:
<u>2) Vertical scale does not begin with zero</u>
Answer:
Identity is verified.
Step-by-step explanation:
We have to verify the identity 
To prove any identity we always prove one side(either left hand side or right hand side) of the equation equal to the other side.
In this identity we take the left hand side first

(as we know cos(a+b) = cosa×cosb-sina×sinb)


= - sinx ( Right hand side)
Hence identity is proved.
What do you need help on? Just post the question.
but it helps with homework and learning how to do stuff you dont know how to do