60
80 100 120 140
160
180
40
20
is 160
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BANE
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Answer:
Explanation:
cos
100
cos
120
cos
140
cos
160
=
cos
(
180
−
80
)
cos
(
180
−
60
)
cos
(
180
−
40
)
cos
(
180
−
20
)
=
(
−
cos
80
)
(
−
cos
60
)
(
−
cos
40
)
(
−
cos
20
)
=
cos
20
×
cos
40
×
cos
80
cos
60
=
1
8
sin
20
×
4
⋅
2
sin
20
×
cos
20
×
cos
40
×
cos
80
cos
60
=
1
8
sin
20
×
2
⋅
2
sin
40
×
cos
40
×
cos
80
cos
60
=
1
8
sin
20
×
2
sin
80
×
cos
80
cos
60
=
1
8
sin
20
×
sin
160
cos
60
=
1
8
sin
20
×
sin
(
180
−
20
)
×
1
2
=
1
16
sin
20
×
sin
20 1 16
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