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Grade: 11

                        

IF atanA+btanB=(a+b)tan((A+B)/2), a not equal to 0. then prove that:acosB=bcosA.

IF atanA+btanB=(a+b)tan((A+B)/2), a not equal to 0. then prove that:acosB=bcosA.

10 years ago

Answers : (1)

mycroft holmes
272 Points
							

Hence, the equation can be written as 

After cross multiplying and simplifying, we get 

or 

If sin(A-B) \= 0, then a cos B = b cos A

10 years ago
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