What equation/process do you need to know to find the exact value of trig expressions such as sin 45 + cos 60, my teacher only lectures and doesn't let us practice in
![Find the exact value of the trigonometric function. Use unit circle. cos 45 degrees | Homework.Study.com Find the exact value of the trigonometric function. Use unit circle. cos 45 degrees | Homework.Study.com](https://homework.study.com/cimages/multimages/16/study_21sep21_exactvalue014181456679200198219.png)
Find the exact value of the trigonometric function. Use unit circle. cos 45 degrees | Homework.Study.com
![How do you draw 45^circ and -45^circ in standard position and then show that cos(-45^circ)=cos45^circ? | Socratic How do you draw 45^circ and -45^circ in standard position and then show that cos(-45^circ)=cos45^circ? | Socratic](https://useruploads.socratic.org/5oVq6IArTzarUyxVzsyz_cos.jpg)