# CHO TAM GIÁC ABCCHỨNG MINH RẰNG: SINA SINB SINC

Prove that an 3a = an 3b = an 3c if sin a + sin b + sin c = 0 & cos a + cos b + cos c = 0
https://math.stackexchange.com/questions/2015438/prove-that-tan-3a-tan-3b-tan-3c-if-sin-a-sin-b-sin-c-0-and
By geometry : (cos a,sin a),(cos b,sin b),(cos c,sin c) are three unit vectors which sum to lớn zero. Then they must be the vertices of an equilateral triangle inscribed in the trigonometric ...

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https://math.stackexchange.com/questions/2651583/finding-relationships-between-angles-a-b-and-c-when-sin-a-sin-b-sin-c
If we plot a vector (or complex number) sketch in which sin alpha = sin eta + sin gamma as follows we can establish some interesting consequential relations. One is given by the length of ...
Let phường = fracx^2x^2 + k, quad q = fracy^2y^2 + k, quad r = fracz^2z^2 + k. Then by assumption phường + q + r = 1. Letting a, b and c be the sides of the triangle, we have by ...

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Is there an elegant way lớn prove that the sequence sin (n)\_n in mathbfN lies dense in <-1, 1> subset mathbfR?
https://www.quora.com/Is-there-an-elegant-way-to-prove-that-the-sequence-sin-n-_-n-in-mathbf-N-lies-dense-in-1-1-subset-mathbf-R
I would vì chưng that : 1 - subgroups of (R,+) are of the form a Z or dense in R. Và that a Z + b Z = c Z is equivalent lớn a/b is rational. 2 - given a surjective và continuous function f, from I ...

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This is the definition of sine law which state that fracasin left( A ight) =fracbsin left( B ight) =fraccsin left( C ight) =2R where R is the circumradius of the ...
It seems that it follows from Jordan's inequality . frac2pi(A + B +C) = 2 le sin(A) + sin (B) + sin (C)
Thêm Mục

left< eginarray l l 2 & 3 \ 5 và 4 endarray ight> left< eginarray l l l 2 và 0 & 3 \ -1 và 1 & 5 endarray ight>

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