Kitos trigonometrinės formulės

Sekantas

$sec\alpha=\frac{1}{\cos \alpha}$

$cossec\alpha=\frac{1}{\sin\alpha}$

$\sin3\alpha=3\sin\alpha-4\sin^3\alpha$

$\cos3\alpha=4\cos^3\alpha-3\cos\alpha$

$tg3\alpha=\frac{3tg\alpha-tg^3\alpha}{1-3tg^2\alpha}$

$ctg3\alpha=\frac{ctg^3\alpha-3ctg\alpha}{3ctg^2\alpha-1}$

$tg\alpha+ctg\alpha=\frac{2}{\sin2\alpha}$

$tg\alpha-ctg\alpha=-2ctg2\alpha$

$sh \ \ u =\frac{e^u-e^{-u}}{2}$

$ch \ \ u=\frac{e^u+e^{-u}}{2}$

$th \ \ u=\frac{sh \ \ u}{ch \ \ u}$
$sh \ \ u$ - hiperbolinis sinusas
$ch \ \ u$ - hiperbolinis kosinusas

$cth \ \ u=\frac{ch \ \ u}{sh \ \ u}$
$sh \ \ u$ - hiperbolinis sinusas
$ch \ \ u$ - hiperbolinis kosinusas