There are 13 dolls in a line. In how many different ways can they be arranged?
2 answers:
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for an angle of 780°, we can say that is really a 360° + 360° + 60°, so two full revolutions plus an extra 60°. Check the picture below, with the coterminal in green.
The solutions are .
Solution:
Given equation:
Add on both sides.
-------- (1)
(given) -------- (2)
Equate (1) and (2).
Add on both sides.
Add 5 on both sides.
Divide by 5 on both sides, we get
Taking square root on both sides, we get
Substitute in (1).
Substitute in (1).
Therefore the solutions are .
Option C is the correct answer.