Carson starts the proof of the law of cosines with sin (A) = by the definition of the sine ratio and cos (A) = (+¹) by the definition of the
cosine ratio
What are the next steps in the proof?
to rewrite each trigonometric equation in terms of the numerator.
in terms of
to relate a, b, c, and A
Use the
Then, Carson can write an expression for side
Next, he can use the