Bila cos (A+B) = sin (A+B) , maka cotg B adalah…

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mintol sama caranya ya…
thank you​

Bila cos (A+B) = sin (A+B) , maka cotg B adalah…

cos (A + B) = sin (A + B)

cos A cos B – sin A sin B = sin A cos B + sin B cos A

cos A cos B – sin A cos B = sin A sin B + sin B cos A

(cos A – sin A) cos B = (sin A + cos A) sin B

frac{ cos(B) }{ sin(B) } = cot(B) = frac{ cos(A) + sin(A) }{ cos(A) - sin(A) }