## Trigonometry (11th Edition) Clone

$$\cos35^\circ=\cos(-35^\circ)$$ 21 goes with G.
$$\cos35^\circ$$ Recall the negative-angle identities for cosines: $$\cos(-\theta)=\cos\theta$$ Therefore, we can rewrite $\cos35^\circ$ as follows: $$\cos35^\circ=\cos(-35^\circ)$$ Hence, we see that 21 is matched with G.