riri45
riri45 riri45
  • 03-02-2018
  • Mathematics
contestada

prove that siny tany +cosy=secy

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annastasia
annastasia annastasia
  • 03-02-2018
sinu x siny/cosy + cosy

= (sin^2 y + cos^2 y)/cosy

= 1/cosy

= secy
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