37) If A = (cos12º - cos 36°) (sin96-sin249)
and B = (sin 60° - sin12) (cos 48° - cos 72°).
then what is equal to?
Answers
Answered by
0
Answer:
it's answer is-2 but not sure
Answered by
0
Answer:
cos12
0
−cos36
0
)(sin96
0
+sin24
0
)
=
(sin60
0
−sin12
0
)(cos(60−12)
0
−cos(60+12)
0
)
(cos12
0
−cos36
0
)(cos6
0
+sin24
0
)
=
(sin60
0
−sin12
0
)(2sin60
0
sin12
0
)
(cos12
0
−cos36
0
)(cos6
0
+sin(30+6)
0
)
=
(
2
3
−sin12
0
)(2×
2
3
sin12
0
)
(cos12
0
−cos(30+6)
0
)(cos6
0
+sin30
0
cos6
0
−cos30
0
sin6
0
)
=
3
sin12
0
(
2
3
−sin12
0
)
(cos12
0
−(cos30
0
cos6
0
−sin30
0
sin6
0
))(cos6
0
+
2
cos6
0
−
2
3
sin6
0
)
=
3
(
2
3
−sin12
0
)sin12
0
(cos12
0
−(
2
3
cos6
0
−
2
sin6
0
))(cos6
0
+
2
cos6
0
−
2
3
sin6
0
)
=1
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