Jawabanmu

Jawaban paling cerdas!
2014-05-31T21:10:54+07:00
(cot A - tan A) sin A
= cot A sin A - tan A sin A
= cos A/sin A . sin A - sin A/cos A . sin A
= cos A - sin
² A/cos A
= (cos² A - sin² A)/cos A
= (cos² A - 1 + cos² A) / cos A
= (2cos² A - 1) / cos A
= 2 cos A - 1/cos A
= 2 cos A - sec A
(terbukti)
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