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The units that are Obtained by combining other units is called Derived Units.
These are called derived units. In the SI system (or metric system), there are base units for length, mass and time, among others. These are:metre (m)kilogram (kg)second (s)The unit of acceleration is expressed as m/s2. An example of a derived unit is the unit of force called the newton (N). Force is equal to mass multiplied by acceleration. Therefore:force = mass × accelerationN = kg·m/s2
These are called derived units. In the SI system (or metric system), there are base units for length, mass and time, among others. These are:metre (m)kilogram (kg)second (s)The unit of acceleration is expressed as m/s2. An example of a derived unit is the unit of force called the newton (N). Force is equal to mass multiplied by acceleration. Therefore:force = mass × accelerationN = kg·m/s2
Cot(12c) = -1.5727 The answer is for angles measured in radians, the mathematical standard. If your angle was measured in other units you should have specified what units. Also, you seem not to be aware but you could have obtained the answer much more easily and quickly by using the calculator that comes as part of your computer.
It depends on what you are trying to convert. There are certains measurements that are equivalent to each other such as 1inch=2.54centimeters.