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BodhiAI
Nov. 12, 2019

Projection Rule:

Projection Rule 

In any ΔABC a = b cos C + c cos B

b = c cos A+ a cos C

c = a cos B + b cos A

Trigonometrical Ratios of Half Angles of a Triangle

Since,

Similarly,

and

again 

Also,

Similarly,

and

From above cases, we can say that