Question

sum the series 3sina+5sin2a+7sin3a+........
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Answer 1

Answer:

34sina

Explanation:

3 sina plus 5 into 2 sina plus 7 into 3 sina

so it is 3 sina plus 10sina plus 21 sina which is 34sina

Answer 2

for finding the sum of the series number of terms need to be given.