<span>arccos (cos pi/2)=?
</span>cos pi/2=0, arccos (0)=?, we know that cos pi/2=0, so cos^-1 (o)= Pi/2, but cos^-1 (o)=arccos (0), so arccos (cos pi/2)=Pi/2
Substitute the values in the expression
b-a=3-2=1
answer b-a=1
Step-by-step explanation:
4 parts of water is to 1 part of glue
Then 1 part of water is to 1/4 parts of glue.
Here's one shortcut:
2.3×10^9=1000(2.3×10^6) because your adding 3 more zeros to 2300000
