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Trigonometric functions specify the relationships between side lengths and interior angles of a right triangle. For example, the sine of angle θ is defined as being the length of the opposite side divided by the length of the hypotenuse.
Other commonly used trigonometric identities include the half-angle identities, the angle sum and difference identities, and the product-to-sum identities. [ 31 ] See also
List of trigonometric identities#Angle sum and difference identities To a section : This is a redirect from a topic that does not have its own page to a section of a page on the subject. For redirects to embedded anchors on a page, use {{ R to anchor }} instead .
So angle n-section is only possible (for general angles) when n is a power of 2. In fact, one only has to prove that the regular n 2 -gon is impossible to construct. -- RDBury ( talk ) 15:55, 6 December 2016 (UTC) [ reply ]
Pages for logged out editors learn more. Contributions; Talk; Angle difference identities
In mathematics, a function f is cofunction of a function g if f(A) = g(B) whenever A and B are complementary angles (pairs that sum to one right angle). [1] This definition typically applies to trigonometric functions. [2] [3] The prefix "co-" can be found already in Edmund Gunter's Canon triangulorum (1620). [4] [5]
The picture proof of the angle sum identities is not valid either since as said before, it only proves the case where 0<angle<pi/2. This page should be cleaned up. And if I can find better proofs of the angle sum identities, I will try and post them. —Preceding unsigned comment added by 65.66.217.117 03:06, 13 July 2008 (UTC)
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