# In trigonometry to prove that sin2π/7+sin4π/7+sin8π/7=√7/2 in trigonometry

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Posted on Jan 02, 2017

SOURCE: Trigonometry proofs

tan y/sin y = sec y; Can you sho me how to prove this?

Posted on Sep 22, 2008

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### Solve it plz......

cos x + root 3 sin x =root 2
cos x + ö3 * Sin x = ö2
squaring both the side
(cos x + ö3 * Sin x)2 = (ö2)2
Cos2 x + 3 * Sin2 x = 2
Cos2 x + Sin2 x + 2 * Sin2 x = 2
1 + 2 * Sin2 x= 2
2 * Sin2 x = 2-1
2 * Sin2 x = 1
Sin2 x = ½
Sin x = ö½
Sin x = 1/V2= Sin 45
X = 450

Aug 28, 2008 | Super Tutor Trigonometry (ESDTRIG) for PC

### Trigonometry proofs

tan y/sin y = sec y; Can you sho me how to prove this?

Aug 05, 2008 | Super Tutor Trigonometry (ESDTRIG) for PC

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