About equal sign | who was invented equal sign | Maths G.K | Tricky questions | #shorts

"The enthalpy of formation of a compound is equal in magnitude but of opposite sign to the enthalpy of decomposition of that compound under the same conditions". This law was presented by:

An open sentence containing the sign is equal to is called an equation

Sign Of Trigonometric Functions|Questions|OMR

In each of the following questions, two words are given to the left side of the sign (::) and one word and a question mark are given to the right side of the of sign (::), select one word from the given alternatives which bears the same relationship to the word given to the right side of sign (::) as that of the words given to the left side of the sign (::). House : Door :: Compound : ?