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Mathematics
Problem
If
f
(
x
)
=
∣
sin
x
−
∣
cos
x
∣
∣
f(x)=|\sin x-|\cos x||
f
(
x
)
=
∣
sin
x
−
∣
cos
x
∣∣
, then the value
f
′
′
(
x
)
f''(x)
f
′′
(
x
)
at
x
=
7
π
/
6
x=7\pi/6
x
=
7
π
/6
is (a) positive (b)
1
−
3
2
\frac{1-\sqrt{3}}{2}
2
1
−
3
(c) 0 (d) none of these
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