ashleyew28 ashleyew28
  • 25-07-2016
  • Mathematics
contestada

Which equation is not an identity?


tan(–t) = –tan t



tan t(csc t + cot t) = sec t + 1



sin tcot t = cos t



cos2t − sin2t = –1

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briannapruna4 briannapruna4
  • 25-07-2016
Not 100% positive but i believe it is the third choice
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Аноним Аноним
  • 25-07-2016
Hey there, 

 Let t = 0 and you'd get 1 - 0 = -1 which is false 

I would go for (D) 
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