Number of solutions of \( \sum_{r=1}^{5} \cos r x=5 \) in the interval \( [0,4 \pi] \) is:
(a) 0... VIDEO
Number of solutions of \( \sum_{r=1}^{5} \cos r x=5 \) in the interval \( [0,4 \pi] \) is:https://bit.ly/YTAI_PWAP https://www.pw.live
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(a) 4
(b) 6
(c) 7
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