Question

1.
Find the value of :
(i)
cos 210°​

Answer 1

Answer:

The value of cos210∘ is simply find by using some trigonometry rules and formulas as we know cos(180+θ)=−cosθ . So add the 180 with the remaining number which is likely to be 210−180=30.

Step-by-step explanation:

hope this helps ;)

Answer 2

Answer:

cos 210

cos(180+30)

-cos30

--√3/2 ans hope it help u mark me as a brainliest