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Question

If 3cosx=1sinx then x=

A
2nπ+π2,2nππ6
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B
nπ±π2 , nπ±π3
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C
nπ±π2,nππ3
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D
nππ2,nπ±π3
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Solution

The correct option is B 2nπ+π2,2nππ6
3cosx=1sinx
32cosx+12sinx=12
cos(xπ6)=cosπ3
The general solution is given by
xπ6=2nπ±π3
x=2nπ+π3+π6,x=2nππ3+π6
x=2nπ+π2,2nππ6

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