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Q.

General solution of 3cosx−sinx=1is

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a

2nπ+π6,2nπ−π2,n∈z

b

2nπ+π3,2nπ−π3,n∈z

c

2nπ,2nπ−2π3

d

2nπ+π4,2nπ+π3

answer is A.

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Detailed Solution

3cosx−sinx=1Dividing by  (3)2+(−1)2=4=2⇒32cosx−12sinx=12⇒cosπ6cosx−sinπ6sinx=12⇒cosx+π6=cosπ3⇒x+π6=2nπ±π3,n∈zx=2nπ±π3−π6=2nπ+π6or 2nπ−π2,n∈z
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General solution of 3cosx−sinx=1is