User:Drummondjacob

From Wikipedia, the free encyclopedia

[edit] Compound Angle Formulae

$\sin (x + y) = \sin (x) \times \cos (y) + \cos (x) \times \sin (y)\,\!$
$\sin (x - y) = \sin (x) \times \cos (y) - \cos (x) \times \sin (y)\,\!$
$\cos (x + y) = \cos (x) \times \cos (y) - \sin (x) \times \sin (y)\,\!$
$\cos (x - y) = \cos (x) \times \cos (y) + \sin (x) \times \sin (y)\,\!$
$\tan (x + y) = \frac { \tan (x) + \tan (y)} {1 - \tan (x) \times \tan (y)}$
$\tan (x - y) = \frac { \tan (x) - \tan (y)} {1 - \tan (x) \times \tan (y)}$
$\cot (x + y) = \frac { \cot(x) \times \cot (y) - 1} { \cot (x) + \cot (y)}$
$\cot (x - y) = \frac { \cot(x) \times \cot (y) + 1} { \cot (y) - \cot (x)}$