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ftshaechan
01.10.2019 •
Mathematics
Prove that sin20sin40sin60sin80=3/16
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Ответ:
Then it's just a matter of filling it in...
sin20sin40 * sin60sin80 = 1/2(cos20 - cos60) * 1/2 (cos20 - cos140) =
1/8( cos40 + 1 - cos160 - cos120 - cos40 - cos80 + cos80 + cos200) =
1/8(1 - cos160 - cos120 + cos200) =
1/8(1 - cos160 - cos120 + cos160) =
1/8(1 - cos120 ) = 1/8( 1 + 1/2 ) = 3/16
Ответ:
Ummm, have u lost ur virginity i dont know, lol its fine if this gets reported
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