Typeset this proof.

This can also be proven using the difference formula for cosine, as seen here.

\(\sin\left(\dfrac{\pi}{2} - \theta\right) = \cos \theta\)

Sine & cosine of complementary angles

\(\cos\left(\dfrac{\pi}{2} - \theta\right) = \sin \theta\)

Sine & cosine of complementary angles

\(\tan\left(\dfrac{\pi}{2} - \theta\right) = \cot \theta\)