三角関数の公式

\sin \theta = \frac{b}{c} \ \ \ \ \ \cos \theta = \frac{a}{c} \ \ \ \ \ \tan \theta = \frac{b}{a}

b = c \cdotp \sin \theta\ \ \ \ \ a = c \cdotp \cos \theta

\sin^{-1} \frac{b}{c} = \theta \ \ \ \ \ \cos^{-1} \frac{a}{c} = \theta \ \ \ \ \ \tan^{-1} \frac{b}{a} = \theta

\csc^{-1} \frac{c}{b} = \theta \ \ \ \ \ \sec^{-1} \frac{c}{a} = \theta \ \ \ \ \ \cot^{-1} \frac{a}{b} = \theta