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Mathematics
Mathematics
Problem
If
A
=
sin
2
x
+
cos
4
x
A = \sin^2 x + \cos^4 x
A
=
sin
2
x
+
cos
4
x
, then for all real
x
x
x
a.
13
16
≤
A
≤
1
\frac{13}{16} \le A \le 1
16
13
≤
A
≤
1
b.
1
≤
A
≤
2
1 \le A \le 2
1
≤
A
≤
2
c.
3
4
≤
A
≤
13
16
\frac{3}{4} \le A \le \frac{13}{16}
4
3
≤
A
≤
16
13
d.
3
4
≤
A
≤
1
\frac{3}{4} \le A \le 1
4
3
≤
A
≤
1
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