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Q.

The general solution of 4cosθ=10-25is

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a

2nπ±3π10

b

nπ+(-1)n.3π10

c

nπ±π10

d

2nπ±π5

answer is A.

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Detailed Solution

cosθ=10-254=cos 3π10      θ=2± 3π10

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