\(0^o\)
\(30^o\)
\(45^o\)
\(60^o\)
\(90^o\)
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
\(\sqrt{3}\)
\(\infty\)
\(2 \cos A \cos B = \cos (A + B) + \cos (A – B)\\
-2 \sin A \sin B = \cos (A + B) + \cos (A – B)\\\)
\(\tan (A \pm B)=\frac{\tan A \pm \tan B}{1 \mp\tan A \tan B}\\
\sin A + \sin B = 2 \sin \frac{1}{2}(A+B)\cos \frac{1}{2}(A – B)\\
\sin A – \sin B = 2 \cos \frac{1}{2}(A+B)\sin \frac{1}{2} (A – B)\\
\cos A + \cos B = 2 \cos \frac{1}{2}(A+B)\cos \frac{1}{2} (A – B)\\
\cos A - \cos B = 2 \sin \frac{1}{2}(A+B)\sin \frac{1}{2} (A – B)\\
\)