Solution of the equation 33sin3x+cos3x+33sinxcosx=1
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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
answer is A.
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Detailed Solution
It is in the form of a3+b3+c3−3abc=0(a+b+c)a2+b2+c2−ab−bc−ca=0,(3sinx)3+(cosx)3+(−1)3−3(3sinx)(cosx)(−1)=03sinx+cosx−1=03sinx+cosx=1, divided by 2sinx+π6=sinπ6x+π6=nπ+(−1)nπ6,n∈z