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Mathematics
Mathematics
Problem
If
x
=
cos
−
1
(
cos
4
)
x = \cos^{-1}(\cos 4)
x
=
cos
−
1
(
cos
4
)
and
y
=
sin
−
1
(
sin
3
)
y = \sin^{-1}(\sin 3)
y
=
sin
−
1
(
sin
3
)
, then which of the following holds? a.
x
−
y
=
1
x - y = 1
x
−
y
=
1
b.
x
+
y
+
1
=
0
x + y + 1 = 0
x
+
y
+
1
=
0
c.
x
+
2
y
=
2
x + 2y = 2
x
+
2
y
=
2
d.
x
+
y
=
3
π
−
7
x + y = 3\pi - 7
x
+
y
=
3
π
−
7
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