Buktikan bahwa Cotan A x Cos A dibagi Cot A + Cos A = 1 - Sin A / Cos A
Fitra910
Cotan A cos A / cot A + cos A = (cos A/ sin A) cos A / (cos A/sin A) + cos A = (cos^2 A/ sin A) / ( cos A + cos A Sin A)/ sin A = cos^2 / cos A +cos A sin A = 1-sin^2 A / cos A ( 1 + sin A) = (1 - sin A)(1+ sin A)/cos A (1+ sin A) = 1-sin A/cos A terbukti
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