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Find the value of tan π/12.

Sagot :

AL2006
pi/12 radians = 180/12 degrees = 15 degrees

tan(15 degrees) = 0.2679... (rounded)
Ok, to get the answer without using a calculator, you first need to draw a right angled triangle with a 30 degree angle. Using a bit of logic and tan(30)=O/A, you will figure out that tan(30)=√3/3. tan(45)=1, this is quite famous.

You can get the answer to tan(15) by using tan(45-30) and the trig identity (tanA-tanB)/(1+tanAtanB).

From there you can produce the result 2-√3=tan(45-30)=tan(15)=tan(π/12)
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