The derivative is -6sin(3x)
the one where they are diagonal from one another
The underlying arithmetic progression is
-15, 0, 15, 30, ...
starting with
and with a common difference of
between terms. Recursively, this sequence is given by

So we have



and so on, so that the explicit rule for the sequence is

for
.
The series consists of 15 terms, since

So we have

and the answer would be B.
Answer:
-8
Step-by-step explanation:
i got it right on khan