Solution: The missing reason in Step 8 is substitution of .
Explanation:
The given steps are used to prove the formula for law of cosines.
From step 5 it is noticed that our equation is
..... (1)
From step 7 it is noticed that the value of is .
So by substituting for in equation (1) we get the equation of step 8, i.e.,
Hence, the missing reason in Step 8 is substitution of .
Answer:
The sign would remain the same.
It would have the same value.
ED2021
The answer is 36 units squared
Ansswer;wait brb.lemme ask my tutor
Step-by-step explanation: