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OABCDCDOCD
B O
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ABCA , AC , ABB , C ,BC
ABCDBC
AB .DC AC .DB BC. AD BD.DC
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x
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a
Abc.cos
db c
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ABCE
AB CE BC AE AB BC AE CE
AB CD BC AD AB BC AD CD
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AE DE AD
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ABCD,AM ND
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T A A ,T O O ,T B B /
T OA O A ,T OB O B ,T AB A B /
T
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TpAB
AA B B
A B
C
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dA ,BMd
AMB
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NMd
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M
l ,l ,l
l ,ll
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ll
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d
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ADAABC
AD AB.AC BD.DC
ADABC E
ABEADC
ABCA , AC , ABB , C ,BC
BC AB AC AB.AC .cos A /
BC cos /
BC BC /
c a C/ / sinC /
sin C sin A sin C sin
B /
C
ABCDBC
AB .DC AC .DB BC. AD BD.DC
DC .AD.BD.cosAB .DC AC .DB AD .DC BD .DC
AB AD BD AD.BD.cos /
DCAB .DC AD .DC BD .DC DC .AD.BD.cos /
AC AD CD AD.CD.cos /
DBAC .DB AD .DB CD .DB DB.AD.CD.cos /
AD .DB CD .D DB.AD.CD.cosB
AB .DC AC .DB AD DC DB BD.CD BD DC /
AB .DC AC .DB AD .BC BD.CD.BC BC . AD BD. D /
/
C
A
B C D
E
A
B C D
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, ,
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ABCBC a , AC b , AB caAD d
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Abc.cos
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ABC ABD ACDS S S /
A AAB.AC .sin A AB.AD.sin AC .AD.sin /
AAB.AC .sin A AB AC .AD.sin /
ABA
si.AC . nA
cos AB AC .AD.A
sin
a a
/
Abc cosA
bc cos b c d / d /b c
A
B C D
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