Answer:
Step-by-step explanation:
We are to show that 
<u>Proof:</u>
From trigonometry identity;


From trigonometry, 2sinAcosA = Sin2A

Also note that sin(B-C) = sinBcosC - cosBsinC
sin420cos140 - cos420sin140 = sin(420-140)
The resulting equation becomes;

= 
Answer:
557
Step-by-step explanation:
l x w
13x24
13x7
22x7
557
Answer:
4xy + 4x² + 4xz
Step-by-step explanation:
4x(y+x+z)
4xy + 4x² + 4xz
Answer:
D
Step-by-step explanation:
All real number less than 5
Answer:
47 degrees
Step-by-step explanation:
43+90= 133
180-133=47