Help me given condition A+B+C=180/2

prove that:
(sin2A+sin2B+sin2C)/(sin2A+sin2B- sin2C)=cotAcotB​

Complete the statements about the system of linear equation respresented by the tables the equation respented the left table is

Student price tickets to a movie are $1 and non student tickets are $2. 350 tickets are sold and the total amount made is $450. how many non student tickets were sold ? a) 100 b) 150 c) 200 d)250

Use the distance formula to find the distance between (-3,5) and (3,1)