Help ASAP please I would love to recieve it right away

Pls! does anybody know a shortcut for answering these types of questions in the future?

Express the following as a function of a single angle. cos(60) cos(-20) - sin(60) sin(-20)

Ialready asked this but i never got an answer. will give a high rating and perhaps brainliest. choose the linear inequality that describes the graph. the gray area represents the shaded region. y ≤ –4x – 2 y > –4x – 2 y ≥ –4x – 2 y < 4x – 2