It may refer to a formula with the letters changed to
F = 1.8C + 32
where C is the temperature in degrees Celsius
and
F is the temperature in degrees Fahrenheit.
It is used mostly in maths as an exercise in manipulating formulae. Nowadays few people use the Fahrenheit scale - (major exception: those from the US with little scientific background).
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144 Formula: c= (a2)+(ab)
Yes. This Formula is known as Euler's Thereom.
combination
You just typed it.
Put a diagonal line through the equals sign to make it "does not equal".