B I’m not 100% sure but I think
A (0,3) B(1,-5) C(4,-1) D(0,-6)
You should search it on youtube becouse pepople cant really explain or draw the shape to show you
Answer:
-90 , 30
Step-by-step explanation:
sina = cos(2a)
= 1 - 2(sina)^2
2(sina)^2 + sina -- 1 = 0
( sina + 1 )( 2sina - 1 ) = 0
sina = -1 or sina = 1/2
=> a = -90 degrees or => a = 30 degrees
