Question

find the value of cos195 without using calculator or table​

Answer 1

Refer to the attachment...

Answer 2

Answer:

1. cos195=cos(180+15)
2. now use cos(a+b) identity
3. =cosa.cosb-sina.sinb
4. =cos180.cos15-sin180.sin15
5. =(1).((√3 + 1 )/2√2)-0
6. =(√3 + 1 )/2√2
7. Step-by-step explanation:
8. hope you understand the answer please mark as brainlist