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coordinates on unit circle
(cos,sin)
arc sin
look at y coordinate in quadrants 1 or 4
arc cos
look at x coordinate in quadrants 1 and 2
arc tan
look at (y/x) or (cos/sin) in quadrants 1 and 4
arithmetic sequence
add/subtract by a common difference (d)
geometric sequence
multiply by a common ratio (R)
recursive
term by term
explicit
find any term
series
add terms up
sum of sequence = series
sequence
list of numbers
for summations of infinite
there is a sum if 0<r<1 but no sum if if r ≥ 1 or r ≤ 0
common ratio
2nd term/1st term