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Problems
Contests
National and Regional Contests
Moldova Contests
Chisinau City MO
1975 Chisinau City MO
99
99
Part of
1975 Chisinau City MO
Problems
(1)
Chisinau MO p99 1975 R1 X sin 54^o - sin 18^o = 0.5
Source:
3/16/2021
Prove the equality:
sin
5
4
o
−
sin
1
8
o
=
0.5
\sin 54^o -\sin 18^o = 0.5
sin
5
4
o
−
sin
1
8
o
=
0.5
trigonometry