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JEE Advanced 2017 Paper 2 Mathematics Q12
Mathematics
Problem
If
f
(
x
)
=
∣
cos
(
2
x
)
cos
(
2
x
)
sin
(
2
x
)
−
cos
x
cos
x
−
sin
x
sin
x
sin
x
cos
x
∣
f(x)=\begin{vmatrix}\cos(2x)&\cos(2x)&\sin(2x)\\-\cos x&\cos x&-\sin x\\\sin x&\sin x&\cos x\end{vmatrix}
f
(
x
)
=
cos
(
2
x
)
−
cos
x
sin
x
cos
(
2
x
)
cos
x
sin
x
sin
(
2
x
)
−
sin
x
cos
x
, then
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