Select the correct answer.
What is the expanded equivalent of sin(a + b)?
A.
sin a cos b - cos a sin b
B.
sin a cos b + cos a sin b
C.
cos a cos b- sin a sin
D.
cos a cos b + sin a sin b

c i think

Step-by-step explanation:

step-by-step explanation: h: (- 3, 6)

m: (1, - 2)

o: (7, 6)

r: (- 9, - 2)

midpoint of hm: (- 1, 2)

midpoint of or: (- 1, 2)

therefore, b is the midpoint of both diagonals bisect each other !

to prove the diagonals are perpendicular, show that the product of the slopes = - 1