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Solve this equation 2cos^2x-9cosx-5=0

Solve this equation 2cos^2x-9cosx-5=0
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1 vote
Solve this equation 2cos^2x-9cosx-5=0

asked
User Zalew
by
8.6k points

1 Answer

4 votes
2 (n π - i tanh^(-1)(sqrt(2/3))) should be the answer
answered
User LHLaurini
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8.5k points
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