Answer:
x=30o+n90on∈Z
Step-by-step explanation:
cos2x=sin(90o−2x)=sin(2x−30o)
Which mean 90o−2x=2x−30o+n360o
or 90o−2x+2x−30o=(2n+1)180o
The later cannot be true.
so x=30o+n90on∈Z
Answer:
6
Step-by-step explanation:
30% of 20 = 30% * 20
= 
* 20
= 6
The answer is b. would u like to see steps or are you good?
