Question

Use the definitions of the trigonometric ratios for a right triangle to derive a cofunction identity for tan(90° - A)

Answer 1

So what's the definition of tangent in terms of sine and cosine?

Answer 2

??

Answer 3

\[\tan A = \frac{\sin A}{\cos A}\]

And if we know that
\[\sin (90º-A)=\cos A\]
and that
\[\cos (90º-A) = \sin A\]
What does that leave us with?