Your classmate kelly, claims that 16 year olds are actually the safest teenage drivers because they have the least number of acc
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Answer:
Attachment below
Step-by-step explanation:
Recall the double/half angle formulas:
We're given , and since
is between π/2 and π, we expect
to be negative. So from the Pythagorean identity, we find
Also, we know will fall between π/4 and π/2, so both
and
will be positive. Then we find
and it follows that