Sin A-sin B-sin Csin A-sin B-sin C-A2B2-

sin A+sin B+sin Csin A+sin B sin C =2sin(A+B2)cos(A B2)+2sin(A+B2cos(A+B2)2sin(A+B2)cos(A B2) 2sin(A+B2cos(A+B2) =cos(A B2)+cos(A+B2)cos(A B2) co ...

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Derivative of Standard Functions

sin A+sin B+s...

Question

$\frac{sin A + sin B + sin C}{sin A + sin B - sin C} = cot \frac{A}{2} cot \frac{B}{2}$ .

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Solution

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