cos(-7π/2) find the value
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Answered by
4
Answer:
You may know that
cos
0
=
1
and
cos
π
=
−
1
If you keep adding
2
π
to the angle, the value doesn't change
So,
cos
π
+
2
π
=
cos
3
⋅
π
is also = - 1. Similarly,
cos
5
⋅
π
,
cos
7
⋅
π
,
cos
9
⋅
π
etc. in general
cos
(
2
⋅
n
+
1
)
⋅
π
, where n is an integer like 1, 2, 3, etc, are -1
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