Class 11 & 12 important formula of trigonometry ncert

Prove by vector metod the following formula of plane trigonometry cos(alpha-beta)=cosalpha cosbeta+sinalpha sinbeta

The formula of freon -12 is :

Chemical formula of Freon 12 is

Class 10 Maths Ex 9.1 examples (Part 2) Ch 9 Some Applications of Trigonometry (Heights & Distances)

Which is the correct formula of freon 12?

Class 12 maths ncert solution chapter vector algebra Ex-10.2 Qno.1

Class 12 ncert maths solution chapter vector algebra exercise 10.2 Qno.4,5

List the name and formulae of two important ores of copper.