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Problem
Problem
Let
y
=
sin
2
x
+
cos
4
x
y = \sin^2 x + \cos^4 x
y
=
sin
2
x
+
cos
4
x
. Then, for all real
x
x
x
a. the maximum value of
y
y
y
is 2 b. the minimum value of
y
y
y
is
3
4
\frac{3}{4}
4
3
c.
y
≤
1
y \le 1
y
≤
1
d.
y
≥
1
4
y \ge \frac{1}{4}
y
≥
4
1
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