Sin and Cos:
\[r=1\]
Turn you head sideways to the right
to see the cos graph.
\[\sin(\theta)=\frac{y}{r}=y\] \[\cos(\theta)=\frac{x}{r}=x\]
Tan and Cot:
\[r=1\]
Turn you head sideways to the right
to see the cot graph.
\[\tan(\theta)=\frac{y}{x}\] \[\cot(\theta)=\frac{x}{y}\]
Sec and Csc:
\[r=1\]
Turn you head sideways to the right
to see the sec graph.
\[\sec(\theta)=\frac{r}{x}=\frac{1}{x}\] \[\csc(\theta)=\frac{r}{y}=\frac{1}{y}\]
