Jawabanmu

2014-04-29T21:00:30+07:00
csc²Ф-1 / csc²Ф = cos²Ф
(1/sin²Ф-sin²Ф/sin²Ф) / csc²Ф = cos²Ф
(1-sin
²Ф/sin²Ф) /csc²Ф=cos²Ф
(cos
²Ф/sin²Ф) :1/sin²Ф= cos²Ф
(cos
)²Ф=cos²Ф
ingat csc= 1/sin