(tanx+secx)(tanx-secx)
Matematika
Nina0902
Pertanyaan
(tanx+secx)(tanx-secx)
1 Jawaban
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1. Jawaban aldyrambe2000
itu akar2 kembar (a+b)(a-b)=a2-b2
jadi
(tanx+secx)(tanx-secx)=tan2x-sec2x
=sin^2x/cos^2x - 1/cos^2x
=sin^2x - 1 / cos^2x
=1 - cos^2x - 1 / cos^2x
=-cos^2x/cos^2x
=-1