Rumus Trigonometri Dalam Kuadran

KUADRAN I (SUDUT ISTIMEWA)

JENIS TRIGONOMETRI	BESAR SUDUT
	${0^o}$	${30^o}$	${45^o}$	${60^o}$	${90^o}$
SIN	$0$	$\frac{1}{2}$	$\frac{1}{2}\sqrt 2 $	$\frac{1}{2}\sqrt 3 $	$1$
COS	$1$	$\frac{1}{2}\sqrt 3 $	$\frac{1}{2}\sqrt 2 $	$\frac{1}{2}$	$0$
TAN	$0$	$\frac{1}{3}\sqrt 3 $	$1$	$\sqrt 3 $	$\infty $

• $\sin \alpha = \cos \left( {{{90}^o} - \alpha } \right)$
• $\cos \alpha = \sin \left( {{{90}^o} - \alpha } \right)$
• $\tan \alpha = \frac{{\sin \alpha }}{{\cos \alpha }}$

KUADRAN II

• $\sin \alpha = \sin \left( {{{180}^o} - \alpha } \right)$
• $\cos \alpha = - \cos \left( {{{180}^o} - \alpha } \right)$
• $\tan \alpha = - \tan \left( {{{180}^o} - \alpha } \right)$

KUADRAN III

• $\sin \alpha = - \sin \left( {{{180}^o} + \alpha } \right)$
• $\cos \alpha = - \cos \left( {{{180}^o} + \alpha } \right)$
• $\tan \alpha = \tan \left( {{{180}^o} + \alpha } \right)$

KUADRAN IV

• $\sin \alpha = - \sin \left( {{{360}^o} - \alpha } \right)$
• $\cos \alpha = \cos \left( {{{360}^o} - \alpha } \right)$
• $\tan \alpha = - \tan \left( {{{360}^o} - \alpha } \right)$
• $\sin \left( { - \alpha } \right) = - \sin \alpha $
• $\cos \left( { - \alpha } \right) = \cos \alpha $
• $\tan \left( { - \alpha } \right) = - \tan \alpha $