What the question and what the picture
Formatted Options:
A. sin²A−cos²A
B. sin²A+cos²A
C. cos²A−sin²A
D. cosA−sinA
Answer:
C. cos²A−sin²A
Step-by-step explanation:
From the double angle formulas, we know that:
cos (A + B) = cosAcosB - sinAsinB
So, if B = A, then the above equation becomes;
cos(A + A) = cosAcosA - sinAsinA [i.e replacing B with A]
=>cos(2A) = (cosA)² - (sinA)²
=> cos(2A) = cos²A - sin²A
Therefore,
cos(2A) is equivalent to cos²A - sin²A
A day has 24 hours, so if you add 23 hours, you are going 1 hour less than a full day. When you are ignoring what day it is, it appears to just be moving back one hour. Therefore, the answer is 7:00 pm. Comment if you have any questions!
Answer:
the rate of change is 20 calories per minute.
Step-by-step explanation:
Let x by the number of cooler
since each cooler has 25 bottles
then in total we have 25x
there are 10 friend in total to divide the bottles equally
we have 25x/10 this expresses the number of bottles each friend will get
that answers part a) of the question
now for part b)
we are told the friend brought 2 cooler
then we should have 25(2)=50 number of bottles in total
then it goes that each one of the friend will get 5 bottles (50/10)
Done !
