Can you show me Trigonometry questions and answers?

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Can you show me Trigonometry questions and answers?

2006-09-17 20:02:48 · 2 answers · asked by pm 1 in Science & Mathematics ➔ Mathematics

2 answers

This one is particularly neat,
cos (pi/7) . cos (2pi/7) . cos (4pi/7) = -1/8

the easiest proof starts with the LHS,
LHS =>
{sin (2pi/7) / 2sin (pi/7)} . cos (2pi/7) . cos (4pi/7)
= {sin (4pi/7) / 4sin (pi/7)} . cos (4pi/7)
= sin (8pi/7) / 8sin (pi/7)
= sin (pi + pi/7) / 8sin (pi/7)
= -sin (pi/7) / 8sin (pi/7)
= -1/8 as required.

Search for trigonometry questions on the net and you'll find neat stuff like this.

2006-09-18 01:21:10 · answer #1 · answered by yasiru89 6 · 0⤊ 0⤋

yes

2006-09-17 20:36:55 · answer #2 · answered by saby 2 · 0⤊ 0⤋