Find the missing side or angle round to the nearest tenth b=15 a=30 c=29 A=[?]°
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We need to write the sum in this form:
So, we need to find an appropriate sequence, such that is the i-th even number.
You can easily check that this series is . In fact, you have
and so on. Finally, we have to observe that we want the first 50 elements of this sequence, since .
So, the sum can be written as