Matematika

Pertanyaan

cot2a - csc2a =

help please

1 Jawaban

  • cot² a - csc² a
    = (1/tan² a ) - (1/sin² a)
    = (cos² a/sin² a) - (1/sin² a)
    = ( cos² a - 1 )/sin² a
    = - (1 - cos² a) / sin² a
    = - sin² a / sin² a
    = -1

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