cos -210 | cos(-210) | First Method

In this video, we learn to find the value of cos(-210). Here I have applied cos(-x) = cos(x) identity to find the value of cos -210. The URL of the video explaining step by step ‘How to prove the identity cos(-x) = cos(x)?’ is given below. Also I have applied cos(180 + x) = -cos(x) identity to find the value of cos-210. The URL of the video explaining step by step ‘How to prove the identity cos(180 + x) = -cos(x)?’ is given below. Other topics of the video are: Value of cos -210 cosine of -210 degree What is the value of cos -210? How to find the value of cos -210? Value of cos(-210) What is the value of cos(-210)? How to find the value of cos(-210)? Value of cosine of -210 What is the value of cosine of -210? How to find the value of cosine of -210? #cos210