Alex is thinking of a doubles fact. The sum is greater than the sum of 7 7 but less than the sum of 8 9. What fact is Alex think
2 answers:
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<u>ANSWER</u>
True
<u>EXPLANATION</u>
The given trigonometric equation is
Recall the double angle identity:
We apply this identity to obtain:
We maintain the LHS and simplify the RHS to see whether they are equal.
Expand the parenthesis
Recall that:
We apply these identities to get:
Also
Therefore the correct answer is True