Sine On Cos Can Turn Into Tan

You'd better swot up, it's hard to get by
Unless you know the graphs from nought to $2\pi$,
Sin on cos can turn into tan.

You're squaring $\sin(x)$, squaring the cos,
You're going to get one whatever $x$ was,
Sin on cos can turn into tan.

You even know the hard ones, you barely have to check
You know that $1 +\tan^2(x)$ becomes the square of sec!

You've drawn it all out, it's easy to see,
$\cos\left(\frac{\pi}{6}\right) = \frac{1}{2} \sqrt 3$*'cos pi by six is a half of root-three'

You've picked up all the formulas, you've read them through and through
The area of a sector is $\frac{r^2 \theta}{2}$ *'r-squared theta over two'

You used to hate radians, now it's your strength
Since you learned that $r \theta$ gives the arc-length
Sin on cos can turn into tan.

Your teacher’s in a Santa hat, you swear that you don’t know her
Because there’s really no excuse for ho-ho-hoh-cah-toa.

You'd better swot up, it's hard to get by
Unless you know the graphs from nought to $2\pi$
Sin on cos can turn into tan.