Buktikan Cos² alfa + tan ² alfa - sec² alfa = - sin² alfa
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Pertanyaan
Buktikan Cos² alfa + tan ² alfa - sec² alfa = - sin² alfa
1 Jawaban
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1. Jawaban yondel
Cos² @ + Tan² @ - Sec² @ = - sin² @
Cos² @ + Tan² @ - ( Tan² @ + 1 )= -Sin² @
Cos² @ + Tan² @ -Tan² @ - 1 = -Sin² @
Cos² @ - 1 = - Sin² @
- Sin² @ = -Sin² @