Lihat sumber Kalkulus/Tabel trigonometri

==Definisi==
*<math>\tan(x)=  \frac{\sin x}{\cos x}</math>
*<math>\sec(x)=  \frac{1}{\cos x}</math>
*<math>\cot(x)=  \frac{\cos x}{\sin x}= \frac{1}{\tan x}</math>
*<math>\csc(x)=  \frac{1}{\sin x}</math>

==Identitas phytagoras==
*<math>\sin^2 x + \cos^2 x =1 \ </math>
*<math>1+\tan^2(x)=  \sec^2 x \ </math>
*<math>1+\cot^2(x)=  \csc^2 x \ </math>

==Identitas sudut ganda==
*<math>\sin(2 x)=  2\sin x \cos x \ </math>
*<math>\cos(2 x)=  \cos^2 x - \sin^2 x \ </math>
*<math>\tan(2x) = \frac{2 \tan (x)} {1 - \tan^2(x)} </math>
*<math>\cos^2(x) = {1 + \cos(2x) \over 2}</math>
*<math>\sin^2(x) = {1 - \cos(2x) \over 2} </math>

==Identitas sudut penjumlahan==
:<math>\sin \left(x+y\right)=\sin x \cos y + \cos x \sin y</math>

:<math>\sin \left(x-y\right)=\sin x \cos y - \cos x \sin y</math>

:<math>\cos \left(x+y\right)=\cos x \cos y - \sin x \sin y</math>

:<math>\cos \left(x-y\right)=\cos x \cos y + \sin x \sin y</math>

:<math>\sin x+\sin y=2\sin \left( \frac{x+y}{2} \right) \cos \left( \frac{x-y}{2} \right) </math>

:<math>\sin x-\sin y=2\cos \left( \frac{x+y}{2} \right) \sin \left( \frac{x-y}{2} \right) </math>

:<math>\cos x+\cos y=2\cos \left( \frac{x+y}{2} \right) \cos \left( \frac{x-y}{2} \right)</math>

:<math>\cos x-\cos y=-2\sin \left( \frac{x+y}{2} \right)\sin \left( \frac{x-y}{2} \right)</math>

:<math>\tan x+\tan y=\frac{\sin \left( x+y\right) }{\cos x\cos y}</math>

:<math>\tan x-\tan y=\frac{\sin \left( x-y\right) }{\cos x\cos y}</math>

:<math>\cot x+\cot y=\frac{\sin \left( x+y\right) }{\sin x\sin y}</math>

:<math>\cot x-\cot y=\frac{-\sin \left( x-y\right) }{\sin x\sin y}</math>

==Identitas perkalian menjadi penjumlahan==

:<math>\cos\left (x\right ) \cos\left (y\right ) = {\cos\left (x + y\right ) + \cos\left (x - y\right ) \over 2} \;</math> 

:<math>\sin\left (x\right ) \sin\left (y\right ) = {\cos\left (x - y\right ) - \cos\left (x + y\right ) \over 2} \;</math> 

:<math>\sin\left (x\right ) \cos\left (y\right ) = {\sin\left (x + y\right ) + \sin\left (x - y\right ) \over 2} \;</math> 

:<math>\cos\left (x\right ) \sin\left (y\right ) = {\sin\left (x + y\right ) - \sin\left (x - y\right ) \over 2} \;</math> 

== Lihat juga ==
* [[Trigonometri]]

[[Kategori:Kalkulus]]