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Questions  

 Solution of the equation 33sin3x+cos3x+33sinxcosx=1

a
x=nπ+−1nπ6−π6,n∈I
b
x=2n+1π6,n∈I
c
x=2nπ+π3,n∈I
d
x=nπ+−1nπ3,n∈I

detailed solution

Correct option is A

It is in the form of a3+b3+c3−3abc=0(a+b+c)a2+b2+c2−ab−bc−ca=0,(3sin⁡x)3+(cos⁡x)3+(−1)3−3(3sin⁡x)(cos⁡x)(−1)=03sin⁡x+cos⁡x−1=03sin⁡x+cos⁡x=1, divided by 2sin⁡x+π6=sin⁡π6x+π6=nπ+(−1)nπ6,n∈z

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